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12h
revised Is there something between summation and integration?
added 499 characters in body
1d
revised How to derive $\sum_{n=0}^\infty 1 = -\frac{1}{2}$ without zeta regularization
added 460 characters in body
1d
revised Proof $\{(x,y,z)|4x^2+9y^2+16z^2<1\}$ is an open set
added 463 characters in body
Jun
24
revised Arnold Trivium Problem 39
added 897 characters in body
Jun
24
revised Arnold Trivium Problem 39
added 226 characters in body
Jun
24
revised Arnold Trivium Problem 39
added 52 characters in body
Jun
23
revised Why does $\cos(x) + \cos(y) - \cos(x + y) = 0$ look like an ellipse?
added 1141 characters in body
Jun
23
revised Why does $\cos(x) + \cos(y) - \cos(x + y) = 0$ look like an ellipse?
added 259 characters in body
Jun
23
revised Why does $\cos(x) + \cos(y) - \cos(x + y) = 0$ look like an ellipse?
added 407 characters in body
Jun
23
revised Why does $\cos(x) + \cos(y) - \cos(x + y) = 0$ look like an ellipse?
deleted 408 characters in body
Jun
23
revised Why does $\cos(x) + \cos(y) - \cos(x + y) = 0$ look like an ellipse?
added 358 characters in body
Jun
15
revised Expansion coefficients of an orthonormal basis must satisfy $c_n n^{1/2}\to 0$ as $n\to \infty$ for $\sum|c_n|^2$ to converge.
deleted 12 characters in body
Jun
15
revised Expansion coefficients of an orthonormal basis must satisfy $c_n n^{1/2}\to 0$ as $n\to \infty$ for $\sum|c_n|^2$ to converge.
added 209 characters in body
Jun
14
revised Two sets $X,Y \subset [0,1]$ such that $X+Y=[0,2]$
added 487 characters in body
Jun
14
revised Limits and Series in Smooth Infinitesimal Analysis
added 787 characters in body
Jun
12
revised Limits and Series in Smooth Infinitesimal Analysis
added 762 characters in body
Jun
12
revised Limits and Series in Smooth Infinitesimal Analysis
added 433 characters in body
Jun
12
revised Integral relations in Fricke and Klein
Clarification about the * formula
Jun
10
revised Integral relations in Fricke and Klein
added 415 characters in body
Jun
10
revised Integral relations in Fricke and Klein
added 417 characters in body