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 May 5 awarded Yearling Jan 19 comment What do mathematicians mean by “equipped” I enjoy the imagery of the inner product hanging out of a pair of pants. Oct 19 answered Finding supremum and infimum of a given set and proving it formally Oct 18 comment Finding supremum and infimum of a given set and proving it formally Are you defining $0 \in \mathbb N$ or not? Sep 30 awarded Explainer Sep 28 answered Concerning Cyclic Groups Sep 24 awarded Autobiographer Sep 11 comment Maximum value of $a+b$ given that $\frac{1}{a} + \frac{1}{b} = \frac{1}{20}$ Some people include 0 to $/mathbb N$ while others do not. Imo $/mathbb Z+$ is more clear. Aug 28 comment Proof of $x*0=0$ is invalid? @AWertheim You're likely correct. My number theory is bit rusty. My point was more explaining why the original proof wasn't sufficient, and that this would suffice, assuming of course that I hadn't assumed anything I wasn't supposed to appeal to. The accepted proof (based on a brief skim) is more elegant, and accepted in general for the reason you gave. Aug 27 comment Proof of $x*0=0$ is invalid? iirc a lot of these "obvious," statements come form distributive laws. This becomes a lot more messy in Boolean algebras where you want to prove associativity, but fortunately, you're not dealing with that. Aug 27 answered Proof of $x*0=0$ is invalid? Aug 27 comment Proof of $x*0=0$ is invalid? To clarify Mike's point, you showed that if there is an a such that a*b=a, then a is 0. However, you failed to show that such an a must exist. Aug 7 comment Proof of trigonometric identity $\cot \theta \sec\theta= 1/ \sin\theta$ You might wish to note that (most simple) statements are true or false. In this case it is either provable or an axiom. You might wish to think about the problem as "how should I prove," rather than "is it possible to prove." Aug 3 comment Spherical bread slices area TBH I'm not sure how to solve it with the approach hinted at in the comments. I thought the question seemed interesting, and I agree that the calc approach is likely better. But the OP asked for the classical solution,I'm not entirely sure of the relevance, though it is clear, and does explain why the statement is true. Aug 3 comment Number of solutions of $1000 / x = y$ where $x$ is a positive integer and $y$ is a $2$-digit positive integer This question (at least now) uses 1000 rather than 100 Aug 2 comment Spherical bread slices area I feel like this answer is more of a clarification, i.e. how to do the problem using calculus, as it doesn't really add any suggestions for the solution other than those in the comments. Am I missing something? Jul 30 comment Proving the following inequality in a triangle Are D,E,F arbitrary? Or are they midpoints? If they are midpoints, then you can use the properties of centroid to say 1/3+1/3+1/3=1 Jul 30 comment Proving the following inequality in a triangle Can we have a diagram? Or an explanation as to what these are. Is this a Triangle ABC with midpoints D,E,F? Jul 30 revised Finding an ODE with specified solutions cleaned up some latex Jul 30 suggested approved edit on Finding an ODE with specified solutions