refine: fix max/min simplification with assumptions - #2170
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The Max/Min visitors in refine() classified each argument independently into sign categories but never compared arguments pairwise. When two arguments fell in the same category (e.g., both 0 and b are nonnegative given b >= 0), neither could be eliminated. Closes symengine#2135
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The Max/Min visitors in refine() classified each argument independently into sign categories but never compared arguments pairwise. When two arguments fell in the same category (e.g., both 0 and b are nonnegative given b >= 0), neither could be eliminated.
Closes #2135