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Answer by egreg for Bugs in conditional structure in a newcommand definition...
The test \IfNoValueTF is never true when the argument you refer to is declared as O, but only with o.I suggest a change in syntax, because two optional arguments in a row are difficult to manage....
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Bugs in conditional structure in a newcommand definition with optional arguments
I am trying to create a new command for add a caption and/or the label to an equation. The not optional parameter is for the text of the equation and first optional parameter is for the label, the...
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