Voyska
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 Nov 19 accepted What is the meaning of primes here? Nov 19 comment What is the meaning of primes here? Oh, in Portuguese, they call it "linha' (line). I always thought it would be "x line" in English. Nov 19 asked What is the meaning of primes here? Nov 13 revised Archimedean integration of $x^3$? deleted 174 characters in body Nov 13 revised Archimedean integration of $x^3$? added 2 characters in body Nov 13 comment Archimedean integration of $x^3$? @Peter Yes. A typo. I'll correct it. And I guess it's cheating because Archimedes didn't have exactly the notion of a limit. Besides, Apostol doesn't use it. Nov 12 asked Archimedean integration of $x^3$? Nov 11 awarded Famous Question Nov 5 accepted Find the points on the ellipse $x^2+2y^2=1$ where the tangent line has slope $1$. Nov 5 asked Find the points on the ellipse $x^2+2y^2=1$ where the tangent line has slope $1$. Oct 20 awarded Popular Question Oct 17 awarded Popular Question Oct 12 comment Is my proof of $-(-a)=a$ correct? Is it too problematic to work on a representation? I wrote some ideas on a paper that was intended to teach mathematics. My goal was to bring up the idea of equivalent rewritings, loosely based on this. So these naive rewritings became my media for doing proofs in mathematics and for the first time I had a deeper access to mathematics. I guess I was following something like the formalist school. Oct 12 accepted Is my proof of $-(-a)=a$ correct? Oct 12 comment Is my proof of $-(-a)=a$ correct? I don't get it. Suppose the scenario you proposed: $a+A=0$. How would you do from here? Oct 12 comment Is my proof of $-(-a)=a$ correct? Good point. I'll think about it. Oct 12 comment Is my proof of $-(-a)=a$ correct? You mean theorem 1.2? Oct 12 comment Is my proof of $-(-a)=a$ correct? If I have $a$ and it's inverse is $-a$, then It seems natural to expect the inverse of $-a$ to be $-(-a)$. That's what I meant with "packing with a minus sign". Oct 12 revised Is my proof of $-(-a)=a$ correct? rolled back to a previous revision Oct 12 asked Is my proof of $-(-a)=a$ correct?