{delimiters} are characters used to specify the boundary between separate blocks/groups of text. They are typically used in {macros} or {math-mode} constructions.

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brace in cases environment being displayed incorrectly because of package yhmath

Could someone please explain why I get this when using a cases environment? The code behind this is $$ \underbrace{\mathrm{u}(\tau )}_{\substack{=1\\ \text{για}\ \tau >0}} ...