Dave
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 Dec5 comment Using set notation, define the set of even natural numbers between 100 and 500. @rubik That would be union, and that is not at all what is meant in the post. Dec5 comment Using set notation, define the set of even natural numbers between 100 and 500. Is the addition of sets a commonly accepted notation? What would $\{a,b\}+\{c,d\}$ result in? Dec3 comment Is there a shape with infinite area but finite perimeter? How about $\Bbb R^2$? Zero perimeter, infinite area. Aug13 comment Is this group isomorphic to $S_n\times Z_m^n$? I think it's a good idea to link this here: Generalized symmetric group Aug7 awarded Quorum Aug7 comment Why is multiplication axiomatized? @JyrkiLahtonen Matrix multiplication is a different matter, in my question I was thinking of real multiplication only. Aug7 asked Why is multiplication axiomatized? Jul30 accepted Is this group isomorphic to $S_n\times Z_m^n$? Jul27 asked Is this group isomorphic to $S_n\times Z_m^n$? Jul26 comment What are some conceptualizations that work in mathematics but are not strictly true? @Jik A triangle between three distant stars will also have an angle sum different from 180 degrees. However, I think that this answer is misleading, because the geometric principle is mathematically true - only that kind of geometry does not work on astronomical scales. Jul26 comment Is $\frac{\textrm{d}y}{\textrm{d}x}$ not a ratio? "...just as $dx$ is not a product." You can get $dx$ by applying the $d$ operator on the $x$ differential form, and as such $dx$ is a group operation, so I think you have the right to call it a product. Jul25 accepted Shortest p-distance Jul24 asked Shortest p-distance Jul2 awarded Curious Apr15 awarded Yearling Feb17 awarded Critic Feb17 asked Condition to sum of geometric series Dec19 asked Half Laplace operator Nov2 accepted Unprovable unprovability of $\forall x\in X:P(x)$ Nov1 asked Unprovable unprovability of $\forall x\in X:P(x)$