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1h
reviewed Approve Show that a positive definite (not necessarily symmetric) matrix induces a hyperellipse
1h
reviewed Approve How to solve polynomial-exponential equation
2h
revised Where is Cauchy's wrong proof?
added 902 characters in body
2h
comment Where is Cauchy's wrong proof?
merci à LeGrandDODOM pour les corrections :)
2h
awarded  Cleanup
2h
revised Where is Cauchy's wrong proof?
added 902 characters in body
2h
revised Where is Cauchy's wrong proof?
rolled back to a previous revision
3h
answered Where is Cauchy's wrong proof?
1d
awarded  Pundit
1d
comment Prove that $\lim_{x \to a} \big[ f(x)+g(x)\big] = p+q$
Your definition of limit is wrong. It shouldn't be if and only if!
2d
reviewed Approve Naive Set Theory by Halmos is confusing to a layman like me
2d
comment Vector space identity from Chow's “You Could Have Invented Spectral Sequences”
Then the answer is "yes, this is correct" ;)
2d
revised Vector space identity from Chow's “You Could Have Invented Spectral Sequences”
added 165 characters in body
2d
answered Vector space identity from Chow's “You Could Have Invented Spectral Sequences”
Apr
21
comment Are the geometric sequences a subspace of all infinite sequences of real numbers
Is $(2^n + 3^n)$ a geometric series? What is the common ratio?
Apr
20
reviewed Approve Finding determinant of a 4x4 matrix
Apr
20
comment Show that if $g((x_n)) \rightarrow l$ and $g((y_n)) \rightarrow m$, then $l=m$
Translating this idea into a non-non-standard proof is left as an exercise to the reader.
Apr
20
answered Show that if $g((x_n)) \rightarrow l$ and $g((y_n)) \rightarrow m$, then $l=m$
Apr
20
comment Adjoint action of a Lie algebra in MAGMA
Why not write a magma function that takes $x,y,n$ as arguments and returns $\operatorname{ad}(x)^n(y)$? It's probably simpler than doing all these conversions. f:=function(x,y,n) output:=y; for i in [1..n] do output := x*output; end for; return output; end function; will do it.
Apr
20
comment Revealing output slowly in Magma
You can redirect magma output into a file, and that's probably the best way to go when the output is large. This is described in the handbook.