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1d
comment Are there contradictions in math?
your friend sounds like a physicist
1d
revised Do rational and irrational numbers flip-flop?
added 87 characters in body
1d
revised Do rational and irrational numbers flip-flop?
added 87 characters in body
1d
comment Do rational and irrational numbers flip-flop?
Off the top of my head (order theory is not my forte) I believe this has to do with the fact that $\mathbb{R}$ with a usual inequality relation isn't well-ordered en.wikipedia.org/wiki/Well-order#Reals
1d
answered Do rational and irrational numbers flip-flop?
Apr
17
asked What assumptions are needed to get two integrals close to each other?
Apr
16
revised Close fourier transforms implies close time domain functions?
added 147 characters in body; edited title
Apr
16
revised Close fourier transforms implies close time domain functions?
edited body; edited tags
Apr
16
asked Close fourier transforms implies close time domain functions?
Apr
10
revised Using IFT to determine whether $f:(x,y)\longmapsto\left(\frac{x^2-y^2}{x^2+y^2},\frac{xy}{x^2+y^2}\right)$ has inverse function near $(0,1)$
added 77 characters in body
Apr
10
comment Using IFT to determine whether $f:(x,y)\longmapsto\left(\frac{x^2-y^2}{x^2+y^2},\frac{xy}{x^2+y^2}\right)$ has inverse function near $(0,1)$
If the determinant is nonzero, we can guarantee that there is an inverse in some neighborhood. If it isn't can you say anything about it?
Apr
10
revised Using IFT to determine whether $f:(x,y)\longmapsto\left(\frac{x^2-y^2}{x^2+y^2},\frac{xy}{x^2+y^2}\right)$ has inverse function near $(0,1)$
added 32 characters in body
Apr
10
asked Using IFT to determine whether $f:(x,y)\longmapsto\left(\frac{x^2-y^2}{x^2+y^2},\frac{xy}{x^2+y^2}\right)$ has inverse function near $(0,1)$
Apr
9
accepted Iterating the chain rule in multiple variables
Apr
9
asked Iterating the chain rule in multiple variables
Mar
31
accepted Rewriting integrals over a symmetrical set
Mar
31
asked Rewriting integrals over a symmetrical set
Mar
28
revised Integrability of sums of Dirac deltas
added 63 characters in body
Mar
28
answered Integrability of sums of Dirac deltas
Mar
28
answered Integral with probabilistic limit