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Failed to parse (unknown function "\gt"): {\displaystyle 0\gt X\lt1\qquad\text{obviously just a test}}

${\displaystyle \mathbf {X} =\{0,\,1,\,\ldots ,\,n\}}$

${\displaystyle {\boldsymbol {\alpha }}=\{\alpha _{1},\,\ldots ,\,\alpha _{C}\}}$