Fdtxjr

I am trying to make a large unary operator from an equal sign =, namely, mathlargerboldsymbol=, but the bars are too close together to distinguish from the general binary case. Is there some package with = having a wider gap that I can use?

Here's a proposal:

documentclassarticle
usepackageamsmath,xparse

ExplSyntaxOn
NewDocumentCommanduneq
 
 mathbinmathpaletteupdraft_uneq:nn 
 

dim_new:N l__updraft_width_dim
dim_new:N l__updraft_height_dim

cs_new_protected:Nn updraft_uneq:nn
 
 vcenter
 
 mathsurround=0pt
 hbox:n
 
 % measure the width of the equals sign in the current style
 hbox_set:Nn l_tmpa_box $#1=$
 dim_set:Nn l__updraft_width_dim box_wd:N l_tmpa_box 
 % measure the width of 1mu in the current style
 hbox_set:Nn l_tmpa_box $#1mkern1mu$
 dim_set:Nn l__updraft_height_dim box_wd:N l_tmpa_box 
 % start drawing
 driver_draw_begin:
 % round caps on lines
 driver_draw_cap_round:
 % set the line width (change 1.2 to your liking)
 driver_draw_linewidth:n 1.2l__updraft_height_dim 
 % 1. cm fonts use width/10 of side bearings
 % 2. the gap between lines is 5 times the line width
 % bottom line
 driver_draw_moveto:nn
 0.1 l__updraft_width_dim 
 -2.5 l__updraft_height_dim 
 driver_draw_lineto:nn
 0.9 l__updraft_width_dim 
 -2.5 l__updraft_height_dim 
 driver_draw_stroke:
 % top line
 driver_draw_moveto:nn
 0.1 l__updraft_width_dim 
 2.5 l__updraft_height_dim 
 driver_draw_lineto:nn
 0.9 l__updraft_width_dim 
 2.5 l__updraft_height_dim 
 driver_draw_stroke:
 driver_draw_end:
 % occupy the space
 hspace l__updraft_width_dim 
 
 
 
ExplSyntaxOff

begindocument

$mathbin=A$

$uneq A$ $scriptstyleuneq A$ $scriptscriptstyleuneq A$

$A=B$

enddocument

There is no “unary operator” class, one has to use mathbin and TeX will act according to the context. You could also decide to simply use mathord.

Another proposal. The optimal vertical spacing might depend on the used font and on personal taste.

documentclassarticle

usepackageamsmath

newcommand*uneqmathpaletteuneqauxrelax
newcommand*uneqaux[2]%
 setbox0=hboxmathsurround=0pt$#1boldsymbol-$%
 raise.25ht0copy0 kern-wd0 lower.2ht0box0


begindocument
$=A$

$uneq A$
$scriptstyleuneq A$
$scriptscriptstyleuneq A$
enddocument

The gap can be tweaked by changing the 4LMpt.

documentclassarticle
usepackagescalerel,stackengine,bm
newcommandbineqmathbinThisStyleensurestackMathvcenterhboxstackengine%
 4LMptSavedStylebm-SavedStylebm-OcFFL
begindocument
$bm= Aquadscriptstylebm= Aquadscriptscriptstylebm= A$ bold =

$bineq Aquadscriptstylebineq Aquadscriptscriptstylebineq A$ verb|bineq|
enddocument