A.Ellett
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 Nov 22 awarded Yearling Sep 28 comment When to use congruent vs approximately? Shouldn't this be posted on the math page? Sep 26 answered Circle of Apollonius proof question Sep 26 revised Does a rhombus bisector creating two equal triangles by reflection imply a square? added 150 characters in body Sep 26 comment Does a rhombus bisector creating two equal triangles by reflection imply a square? The intuitive idea underlying congruence is "perfectly overlap" if properly aligned. If they overlap by reflection, then they are congruent. Sep 26 comment Does a rhombus bisector creating two equal triangles by reflection imply a square? @Dgrin91 I think you are not understanding correctly what it means to "reflect" around something. In a rhombus, to reflect about a diagonal would be like folding the rhombus along its diagonal. If it is indeed a rhombus, the two triangles will match perfectly. Sep 26 comment Does a rhombus bisector creating two equal triangles by reflection imply a square? @Dgrin91 My response is about "reflection" about the diagonal. You are mistaken about the triangles on either side of a diagonal. Sep 26 revised Does a rhombus bisector creating two equal triangles by reflection imply a square? added 237 characters in body Sep 26 answered Does a rhombus bisector creating two equal triangles by reflection imply a square? Sep 26 answered If a quadrilateral is a parallelogram and a rhombus, does that imply it is a square? Feb 24 comment What is category theory useful for? @Khromonkey others seem to have already covered the content of your question. I'll direct you to the answers of the other posters. Feb 24 answered What is category theory useful for? Feb 24 awarded Supporter Dec 13 answered Proving that this $(X,Y)$ is not uniformly distributed over the unit disk Dec 13 revised Logic Puzzle from “101 Puzzles in Thought and Logic” added 47 characters in body Dec 13 revised Logic Puzzle from “101 Puzzles in Thought and Logic” added 31 characters in body Dec 13 answered Logic Puzzle from “101 Puzzles in Thought and Logic” Dec 13 answered The set of continuously differentiable functions such that $f(0)=0$, $f(1)=1$, $|f'|\le 3/4$ Dec 13 awarded Teacher Dec 13 revised antiderivative of $\frac{1}{4}\sin(2x)$ added 36 characters in body