diff options
Diffstat (limited to 'tex/context/base/mkxl/math-stc.mklx')
| -rw-r--r-- | tex/context/base/mkxl/math-stc.mklx | 308 |
1 files changed, 172 insertions, 136 deletions
diff --git a/tex/context/base/mkxl/math-stc.mklx b/tex/context/base/mkxl/math-stc.mklx index 5922fb116..fdad71978 100644 --- a/tex/context/base/mkxl/math-stc.mklx +++ b/tex/context/base/mkxl/math-stc.mklx @@ -78,47 +78,35 @@ % At some point we can consider to use the more natural \LUAMETATEX\ features but the % problem is that we lack proper support in fonts and we also have less control. -\installcorenamespace {mathextensiblefallbacks} +%installcorenamespace {mathextensiblefallbacks} -% currently no italic correction ... problem is that we don't know yet if we have an italic -% below so we we need to postpone - -% \def\math_stackers_fallback -% {\hbox to \scratchwidth{\csname\??mathextensiblefallbacks\ifcsname\??mathextensiblefallbacks\number\scratchunicode\endcsname\number\scratchunicode\fi\endcsname}} -% %{\csname\??mathextensiblefallbacks\ifcsname\??mathextensiblefallbacks\number\scratchunicode\endcsname\number\scratchunicode\fi\endcsname } +% In math mode we no longer fallback, simply because only a few fonts implement +% extensible using minus and equal signs. So either we provide a tweaked one or we +% simply ignore the lack. Better choose a font that matches expectations that some +% fragile imperfect hackery. \def\math_stackers_fallback {\mathstylehbox to \scratchwidth{\usemathstackerscolorparameter\c!color \hss \hskip\mathstackersparameter\c!topoffset\relax % for manual italic correction - \ifcsname\??mathextensiblefallbacks\number\scratchunicode\endcsname - \lastnamedcs - \else + % \ifcsname\??mathextensiblefallbacks\number\scratchunicode\endcsname + % \lastnamedcs + % \else \Umathchar\zerocount\zerocount\scratchunicode - \fi + % \fi \hss}} -% \def\math_stackers_regular -% {\mathstylehbox{\usemathstackerscolorparameter\c!color -% \hskip\d_math_stackers_offset_l -% \Umathaccent\zerocount\zerocount\scratchunicode -% {\hskip\dimexpr\scratchwidth-\d_math_stackers_offset_l-\d_math_stackers_offset_r}% -% \hskip\d_math_stackers_offset_r -% }} - -% \def\math_stackers_stretch % we don't have that one yet -% {\mathstylehbox{\usemathstackerscolorparameter\c!color -% \hskip\d_math_stackers_offset_l -% \Umathaccent\zerocount\zerocount\scratchunicode -% {\hskip\dimexpr\hsize-\d_math_stackers_offset_l-\d_math_stackers_offset_r}% -% \hskip\d_math_stackers_offset_r -% }} - \def\math_stackers_regular {\mathstylehbox{\usemathstackerscolorparameter\c!color \hskip\d_math_stackers_offset_l \Uhextensible middle + \ifcstok{\mathstackersparameter\c!stretch}\v!yes + stretch + \fi + \ifcstok{\mathstackersparameter\c!shrink}\v!yes + shrink + \fi width \dimexpr\scratchwidth-\d_math_stackers_offset_l-\d_math_stackers_offset_r\relax \zerocount\scratchunicode \relax @@ -130,18 +118,8 @@ % $\Umathaccent 0 0 "2190{x}$ \par $\Umathaccent 0 0 "27F8{x}$\par % $\Udelimiterunder 0 "2190{x}$ \par $\Udelimiterunder 0 "27F8{x}$\par -\defcsname\??mathextensiblefallbacks\endcsname - {\hpack{\vrule\s!width\scratchwidth\s!height.1\mathexheight\s!depth\zeropoint}} - -% \def\math_stackers_with_fallback#codepoint% -% {\begingroup -% \scratchunicode#codepoint\relax -% \ifcase\mathextensiblecode\fam\scratchunicode\relax -% \math_stackers_fallback -% \else -% \math_stackers_stretch -% \fi -% \endgroup} +% \defcsname\??mathextensiblefallbacks\endcsname +% {\hpack{\vrule\s!width\scratchwidth\s!height.1\mathexheight\s!depth\zeropoint}} %D We don't really need this because we can assume that fonts have the right %D extensibles. If needed I will make a general virtual extender for \OPENTYPE\ @@ -337,6 +315,28 @@ \scratchbottomoffset\zeropoint \fi} +\def\math_stackers_get_max_width + {\ifdim\wd\scratchboxone>\scratchwidth + \scratchwidth\wd\scratchboxone + \fi + \ifdim\wd\scratchboxtwo>\scratchwidth + \scratchwidth\wd\scratchboxtwo + \fi + \ifdim\wd\scratchboxthree>\scratchwidth + \scratchwidth\wd\scratchboxthree + \fi} + +\def\math_stackers_set_max_width + {\ifdim\wd\scratchboxone<\scratchwidth + \setbox\scratchboxone\hpack to \scratchwidth{\hss\unhbox\scratchboxone\hss}% unhboxing makes leaders work + \fi + \ifdim\wd\scratchboxtwo<\scratchwidth + \setbox\scratchboxtwo\hpack to \scratchwidth{\hss\unhbox\scratchboxtwo\hss}% + \fi + \ifdim\wd\scratchboxthree<\scratchwidth + \setbox\scratchboxthree\hpack to \scratchwidth{\hss\unhbox\scratchboxthree\hss}% + \fi} + \protected\def\math_stackers_triplet#method#category#codepoint#toptext#bottomtext% {\begingroup \edef\currentmathstackers{#category}% @@ -395,19 +395,7 @@ \else \setmathtextbox\scratchboxthree\hbox{\math_stackers_middletext}% \fi - \scratchwidth\wd - \ifdim\wd\scratchboxone>\wd\scratchboxtwo - \ifdim\wd\scratchboxone>\wd\scratchboxthree - \scratchboxone - \else - \scratchboxthree - \fi - \orelse\ifdim\wd\scratchboxtwo>\wd\scratchboxthree - \scratchboxtwo - \else - \scratchboxthree - \fi - \relax + \math_stackers_get_max_width \fi % \scratchdimen\mathstackersparameter\c!minwidth\relax @@ -421,19 +409,11 @@ \setbox\scratchboxthree\csname\??mathstackersalternative\p_alternative\endcsname \dostoptagged \fi - \ifdim\wd\scratchboxthree>\scratchwidth - \scratchwidth\wd\scratchboxthree - \fi +% \ifdim\wd\scratchboxthree>\scratchwidth +% \scratchwidth\wd\scratchboxthree +% \fi % - \ifdim\wd\scratchboxone<\scratchwidth - \setbox\scratchboxone\hpack to \scratchwidth{\hss\unhbox\scratchboxone\hss}% unhboxing makes leaders work - \fi - \ifdim\wd\scratchboxtwo<\scratchwidth - \setbox\scratchboxtwo\hpack to \scratchwidth{\hss\unhbox\scratchboxtwo\hss}% - \fi - \ifdim\wd\scratchboxthree<\scratchwidth - \setbox\scratchboxthree\hpack to \scratchwidth{\hss\unhbox\scratchboxthree\hss}% - \fi + \math_stackers_set_max_width % \ifcsname\??mathstackerslocation\p_location\endcsname \ifcase\csname\??mathstackerslocation\p_location\endcsname\relax @@ -458,7 +438,6 @@ \ifzeropt\scratchdistance\else \setbox\scratchboxthree\hpack{\lower\scratchdistance\box\scratchboxthree}% \fi - % \math_stackers_normalize_three % analysis \ifdim\htdp\scratchboxtwo>\zeropoint @@ -625,6 +604,8 @@ \fi % \math_stackers_normalize_three + \math_stackers_get_max_width + \math_stackers_set_max_width % analysis \ifcase\c_math_stackers_bottom \ifcase\c_math_stackers_top @@ -654,7 +635,7 @@ \math_stackers_bottom\bgroup \lower\dimexpr \scratchdepth - +\ht\scratchboxtwo + +\ht\ifcase\c_math_stackers_top\scratchboxtwo\else\scratchboxone\fi +\mathstackersparameter\c!distance % was \c!voffset \relax \ifcase\c_math_stackers_top @@ -973,6 +954,7 @@ [\v!both] [\v!mathematics] [\c!location=\v!top, % ? + \c!mathclass=\s!accent, % check chemistry \c!strut=\v!no, \c!middlecommand=\mathematics, \c!hoffset=\zeropoint] @@ -989,7 +971,10 @@ [\v!vfenced] [\v!both] [\c!mathclass=\s!ordinary, - \c!mathlimits=\v!yes] + \c!mathlimits=\v!yes, + % only these arrows make sense + \c!stretch=\v!yes, + \c!shrink=\v!yes] % these are needed for mathml: @@ -1085,10 +1070,10 @@ \definemathextensible [\v!mathematics] [mequal] ["003D] \definemathextensible [\v!mathematics] [mleftarrow] ["2190] % ["27F5] \definemathextensible [\v!mathematics] [mrightarrow] ["2192] % ["27F6] -\definemathextensible [\v!mathematics] [mleftrightarrow] ["27F7] -\definemathextensible [\v!mathematics] [mLeftarrow] ["27F8] -\definemathextensible [\v!mathematics] [mRightarrow] ["27F9] -\definemathextensible [\v!mathematics] [mLeftrightarrow] ["27FA] +\definemathextensible [\v!mathematics] [mleftrightarrow] ["2194] +\definemathextensible [\v!mathematics] [mLeftarrow] ["21D0] +\definemathextensible [\v!mathematics] [mRightarrow] ["21D2] +\definemathextensible [\v!mathematics] [mLeftrightarrow] ["21D4] \definemathextensible [\v!mathematics] [mtwoheadleftarrow] ["219E] \definemathextensible [\v!mathematics] [mtwoheadrightarrow] ["21A0] \definemathextensible [\v!mathematics] [mmapsto] ["21A6] @@ -1109,12 +1094,13 @@ \definemathextensible [\v!text] [tmapsto] ["21A6] \definemathextensible [\v!text] [tleftarrow] ["2190] % ["27F5] \definemathextensible [\v!text] [trightarrow] ["2192] % ["27F6] -\definemathextensible [\v!text] [tleftrightarrow] ["27F7] -\definemathextensible [\v!text] [tLeftarrow] ["27F8] -\definemathextensible [\v!text] [tRightarrow] ["27F9] -\definemathextensible [\v!text] [tLeftrightarrow] ["27FA] +\definemathextensible [\v!text] [tleftrightarrow] ["2194] +\definemathextensible [\v!text] [tLeftarrow] ["21D0] +\definemathextensible [\v!text] [tRightarrow] ["21D2] +\definemathextensible [\v!text] [tLeftrightarrow] ["21D4] \definemathextensible [\v!text] [ttwoheadleftarrow] ["219E] \definemathextensible [\v!text] [ttwoheadrightarrow] ["21A0] +\definemathextensible [\v!text] [tmapsto] ["21A6] \definemathextensible [\v!text] [thookleftarrow] ["21A9] \definemathextensible [\v!text] [thookrightarrow] ["21AA] \definemathextensible [\v!text] [tleftharpoondown] ["21BD] @@ -1127,25 +1113,47 @@ \definemathextensible [\v!text] [trightleftharpoons] ["21CC] \definemathextensible [\v!text] [ttriplerel] ["2261] -\definemathoverextensible [\v!top] [overleftarrow] ["2190] % ["27F5] -\definemathoverextensible [\v!top] [overrightarrow] ["2192] % ["27F6] -\definemathoverextensible [\v!top] [overleftrightarrow] ["27F7] -\definemathoverextensible [\v!top] [overtwoheadleftarrow] ["27F8] -\definemathoverextensible [\v!top] [overtwoheadrightarrow] ["27F9] -\definemathoverextensible [\v!top] [overleftharpoondown] ["21BD] -\definemathoverextensible [\v!top] [overleftharpoonup] ["21BC] -\definemathoverextensible [\v!top] [overrightharpoondown] ["21C1] -\definemathoverextensible [\v!top] [overrightharpoonup] ["21C0] +\definemathoverextensible [\v!top] [overleftarrow] ["2190] % ["27F5] +\definemathoverextensible [\v!top] [overrightarrow] ["2192] % ["27F6] +\definemathoverextensible [\v!top] [overleftrightarrow] ["2194] % ["27F7] +\definemathoverextensible [\v!top] [overtwoheadleftarrow] ["219E] % ["27F8] +\definemathoverextensible [\v!top] [overtwoheadrightarrow] ["21A0] % ["27F9] +\definemathoverextensible [\v!top] [overlefttailarrow] ["21A2] +\definemathoverextensible [\v!top] [overrighttailarrow] ["21A3] +\definemathoverextensible [\v!top] [overleftbararrow] ["21A4] +\definemathoverextensible [\v!top] [overrightbararrow] ["21A6] +\definemathoverextensible [\v!top] [overlefthookarrow] ["21A9] +\definemathoverextensible [\v!top] [overrighthookarrow] ["21AA] +\definemathoverextensible [\v!top] [overleftharpoondown] ["21BD] +\definemathoverextensible [\v!top] [overleftharpoonup] ["21BC] +\definemathoverextensible [\v!top] [overrightharpoondown] ["21C1] +\definemathoverextensible [\v!top] [overrightharpoonup] ["21C0] +\definemathoverextensible [\v!top] [overRightarrow] ["21D2] % ["27F9] +\definemathoverextensible [\v!top] [overLeftarrow] ["21D0] % ["27F8] +\definemathoverextensible [\v!top] [overLeftrightarrow] ["21D4] % ["27F8] +\definemathoverextensible [\v!top] [overLeftbararrow] ["2906] +\definemathoverextensible [\v!top] [overRightbararrow] ["2907] \definemathunderextensible [\v!bottom] [underleftarrow] ["2190] % ["27F5] \definemathunderextensible [\v!bottom] [underrightarrow] ["2192] % ["27F6] -\definemathunderextensible [\v!bottom] [underleftrightarrow] ["27F7] -\definemathunderextensible [\v!bottom] [undertwoheadleftarrow] ["27F8] -\definemathunderextensible [\v!bottom] [undertwoheadrightarrow] ["27F9] +\definemathunderextensible [\v!bottom] [underleftrightarrow] ["2194] % ["27F7] +\definemathunderextensible [\v!bottom] [undertwoheadleftarrow] ["219E] % ["27F8] +\definemathunderextensible [\v!bottom] [undertwoheadrightarrow] ["21A0] % ["27F9] +\definemathunderextensible [\v!bottom] [underlefttailarrow] ["21A2] +\definemathunderextensible [\v!bottom] [underrighttailarrow] ["21A3] +\definemathunderextensible [\v!bottom] [underleftbararrow] ["21A4] +\definemathunderextensible [\v!bottom] [underrightbararrow] ["21A6] +\definemathunderextensible [\v!bottom] [underlefthookarrow] ["21A9] +\definemathunderextensible [\v!bottom] [underrighthookarrow] ["21AA] \definemathunderextensible [\v!bottom] [underleftharpoondown] ["21BD] \definemathunderextensible [\v!bottom] [underleftharpoonup] ["21BC] \definemathunderextensible [\v!bottom] [underrightharpoondown] ["21C1] \definemathunderextensible [\v!bottom] [underrightharpoonup] ["21C0] +\definemathunderextensible [\v!bottom] [underRightarrow] ["21D2] % ["27F9] +\definemathunderextensible [\v!bottom] [underLeftarrow] ["21D0] % ["27F8] +\definemathunderextensible [\v!bottom] [underLeftrightarrow] ["21D4] % ["27F8] +\definemathunderextensible [\v!bottom] [underLeftbararrow] ["2906] +\definemathunderextensible [\v!bottom] [underRightbararrow] ["2907] %D We don't use overline and underline. This is one of the overlooked aspects of %D unicode cq. opentype math: why treat rules different than e.g. arrows and @@ -1206,53 +1214,76 @@ \definemathextensible [\v!chemistry] [crightoverleftarrow] ["21C4] \definemathextensible [\v!chemistry] [cleftoverrightarrow] ["21C6] -\def\math_stackers_hacked_fill#1#2#3% - {\mathematics - {\begingroup - \mathsurround\zeropoint - \thickmuskip \zeromuskip - \medmuskip \zeromuskip - \thinmuskip \zeromuskip - \tinymuskip \zeromuskip - \pettymuskip \zeromuskip - \ifrelax#1% - \cleaders\mathstylehbox{#2}\hfill - \else - #1% - \mkern-7\onemuskip - \cleaders\mathstylehbox{\mkern-2\onemuskip#2\mkern-2\onemuskip}\hfill - \mkern-7\onemuskip - #3% - \fi - \endgroup}} - -\immutable\protected\def\rightarrowfill {\math_stackers_hacked_fill \relbar \relbar \rightarrow} -\immutable\protected\def\leftarrowfill {\math_stackers_hacked_fill \leftarrow \relbar \relbar} -\immutable\protected\def\rightoverleftarrowfill{\math_stackers_hacked_fill \relax \crightoverleftarrow \relax} -\immutable\protected\def\leftoverrightarrowfill{\math_stackers_hacked_fill \relax \cleftoverrightarrow \relax} -\immutable\protected\def\equalfill {\math_stackers_hacked_fill \Relbar \Relbar \Relbar} -\immutable\protected\def\Rightarrowfill {\math_stackers_hacked_fill \Relbar \Relbar \Rightarrow} -\immutable\protected\def\Leftarrowfill {\math_stackers_hacked_fill \Leftarrow \Relbar \Relbar} -\immutable\protected\def\Leftrightarrowfill {\math_stackers_hacked_fill \Leftarrow \Relbar \Rightarrow} -\immutable\protected\def\leftrightarrowfill {\math_stackers_hacked_fill \leftarrow \relbar \rightarrow} -\immutable\protected\def\mapstofill {\math_stackers_hacked_fill{\mapstochar\relbar} \relbar \rightarrow} -\immutable\protected\def\twoheadrightarrowfill {\math_stackers_hacked_fill \relbar \relbar \twoheadrightarrow} -\immutable\protected\def\twoheadleftarrowfill {\math_stackers_hacked_fill \twoheadleftarrow \relbar \relbar} -\immutable\protected\def\rightharpoondownfill {\math_stackers_hacked_fill \relbar \relbar \rightharpoondown} -\immutable\protected\def\rightharpoonupfill {\math_stackers_hacked_fill \relbar \relbar \rightharpoonup} -\immutable\protected\def\leftharpoondownfill {\math_stackers_hacked_fill \leftharpoondown \relbar \relbar} -\immutable\protected\def\leftharpoonupfill {\math_stackers_hacked_fill \leftharpoonup \relbar \relbar} -\immutable\protected\def\hookleftfill {\math_stackers_hacked_fill \leftarrow \relbar {\relbar\joinrel\rhook}} -\immutable\protected\def\hookrightfill {\math_stackers_hacked_fill{\lhook\joinrel\relbar}\relbar \rightarrow} -\immutable\protected\def\relfill {\math_stackers_hacked_fill \relbar \relbar \relbar} -\immutable\protected\def\triplerelfill {\math_stackers_hacked_fill \equiv \equiv \equiv} - -%D For the moment (needs checking): +% \def\math_stackers_hacked_fill#1#2#3% +% {\mathematics +% {\begingroup +% \mathsurround\zeropoint +% \thickmuskip \zeromuskip +% \medmuskip \zeromuskip +% \thinmuskip \zeromuskip +% \tinymuskip \zeromuskip +% \pettymuskip \zeromuskip +% \ifrelax#1% +% \cleaders\mathstylehbox{#2}\hfill +% \else +% #1% +% \mkern-7\onemuskip +% \cleaders\mathstylehbox{\mkern-2\onemuskip#2\mkern-2\onemuskip}\hfill +% \mkern-7\onemuskip +% #3% +% \fi +% \endgroup}} +% +% \immutable\protected\def\rightarrowfill {\math_stackers_hacked_fill \relbar \relbar \rightarrow} +% \immutable\protected\def\leftarrowfill {\math_stackers_hacked_fill \leftarrow \relbar \relbar} +% \immutable\protected\def\rightoverleftarrowfill{\math_stackers_hacked_fill \relax \crightoverleftarrow \relax} +% \immutable\protected\def\leftoverrightarrowfill{\math_stackers_hacked_fill \relax \cleftoverrightarrow \relax} +% \immutable\protected\def\equalfill {\math_stackers_hacked_fill \Relbar \Relbar \Relbar} +% \immutable\protected\def\Rightarrowfill {\math_stackers_hacked_fill \Relbar \Relbar \Rightarrow} +% \immutable\protected\def\Leftarrowfill {\math_stackers_hacked_fill \Leftarrow \Relbar \Relbar} +% \immutable\protected\def\Leftrightarrowfill {\math_stackers_hacked_fill \Leftarrow \Relbar \Rightarrow} +% \immutable\protected\def\leftrightarrowfill {\math_stackers_hacked_fill \leftarrow \relbar \rightarrow} +% \immutable\protected\def\mapstofill {\math_stackers_hacked_fill{\mapstochar\relbar} \relbar \rightarrow} +% \immutable\protected\def\twoheadrightarrowfill {\math_stackers_hacked_fill \relbar \relbar \twoheadrightarrow} +% \immutable\protected\def\twoheadleftarrowfill {\math_stackers_hacked_fill \twoheadleftarrow \relbar \relbar} +% \immutable\protected\def\rightharpoondownfill {\math_stackers_hacked_fill \relbar \relbar \rightharpoondown} +% \immutable\protected\def\rightharpoonupfill {\math_stackers_hacked_fill \relbar \relbar \rightharpoonup} +% \immutable\protected\def\leftharpoondownfill {\math_stackers_hacked_fill \leftharpoondown \relbar \relbar} +% \immutable\protected\def\leftharpoonupfill {\math_stackers_hacked_fill \leftharpoonup \relbar \relbar} +% \immutable\protected\def\hookleftfill {\math_stackers_hacked_fill \leftarrow \relbar {\relbar\joinrel\rhook}} +% \immutable\protected\def\hookrightfill {\math_stackers_hacked_fill{\lhook\joinrel\relbar}\relbar \rightarrow} +% \immutable\protected\def\relfill {\math_stackers_hacked_fill \relbar \relbar \relbar} +% \immutable\protected\def\triplerelfill {\math_stackers_hacked_fill \equiv \equiv \equiv} +% +% \permanent\tolerant\protected\def\defineextensiblefiller[#1]#*[#2]% +% {\immutable\letcsname\??mathextensiblefallbacks\number#2\expandafter\endcsname\csname#1\endcsname} + +\installcorenamespace {mathadaptiveextensible} + +\defineadaptive + [mathfiller] + [\c!setups=adaptive:mathfiller, + \c!stretch=1fill] + +\startsetups adaptive:mathfiller + \setbox\usedadaptivebox\hbox to \usedadaptivewidth \bgroup + \startimath + \Uhextensible + \s!width \usedadaptivewidth + \s!middle \zerocount \usedadaptivealternative + \relax + \stopimath + \egroup +\stopsetups + +\def\mathfiller#1% + {\begingroup + \scratchunicode#1\relax + \adaptivebox[mathfiller][\c!alternative=#1]{\hss\strut\hss}% + \endgroup} \permanent\tolerant\protected\def\defineextensiblefiller[#1]#*[#2]% - {\immutable\letcsname\??mathextensiblefallbacks\number#2\expandafter\endcsname\csname#1\endcsname - %\immutable\letcsname#1\expandafter\endcsname\csname#1\endcsname - } % huh? + {\frozen\instance\edefcsname#1\endcsname{\mathfiller{\number#2}}} %defineextensiblefiller [barfill] ["203E] % yet undefined \defineextensiblefiller [relfill] ["002D] @@ -1302,14 +1333,18 @@ {\begingroup \edef\currentmathstackers{#category}% \edef\p_moffset{\mathstackersparameter\c!moffset}% - \ifempty\p_moffset \else - \mskip\p_moffset\relax + \ifconditional\indisplaymath + \ifempty\p_moffset \else + \ifmmode\mskip\else\hskip\fi\p_moffset\relax + \fi \fi \ifmmode\math_atom_by_parameter\mathstackersparameter\else\dontleavehmode\fi {\usemathstackerscolorparameter\c!color \Umathchar\zerocount\zerocount#codepoint}% - \ifempty\p_moffset \else - \mskip\p_moffset\relax + \ifconditional\indisplaymath + \ifempty\p_moffset \else + \ifmmode\mskip\else\hskip\fi\p_moffset\relax + \fi \fi \endgroup} @@ -1319,6 +1354,7 @@ \definemathunstacked [\v!wide] [impliedby] ["27F8] % \mathrel{\;\Longleftarrow\;} \definemathunstacked [\v!wide] [implies] ["27F9] % \mathrel{\;\Longrightarrow\;} \definemathunstacked [\v!wide] [iff] ["27FA] % \mathrel{\;\Longleftrightarrow\;} +\definemathunstacked [\v!wide] [impliesby] ["27FA] % \mathrel{\;\Longleftrightarrow\;} % New (an example of using \mathexheight): |