[Tex/LaTex] How to get filled black < and \leq


I want to define an order relation where I to distinguish want to fill in with black so that I have a black lying triangle in the first case and a black lying triangle with the suitable line below as in \leq in the second case. I am not satisfied with \blacktriangleleft and \overset{\blacktriangleleft}{-}.

Best Answer

Here's the \ooalign black magic:



$a\bleq b\leq c$


enter image description here

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