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21h
answered Algorithm to approximate this cos(x) equation by successions
21h
answered Find closed form for a sequence using the Fibonacci and Lucas number sequences.
1d
comment $i^2$ why is it $-1$ when you can show it is $1$?
@columbus8myhw, fixed, thanks.
1d
revised $i^2$ why is it $-1$ when you can show it is $1$?
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1d
answered Computing the galois group of $x^3+3x+1$
1d
comment Kernel and Image of a group homomorphism
Just to be clear: $G$ is the multiplicative group of non-zero complex numbers, right?
1d
comment Request for apps for Mathematical Drawing
See also en.wikipedia.org/wiki/List_of_interactive_geometry_software.
1d
comment Request for apps for Mathematical Drawing
Can you give examples of the type of drawing you mean?
1d
answered Request for apps for Mathematical Drawing
1d
answered Proving that if $a,b,c\in \mathbb N$ and $a^2+b^2=c^2$ then $abc$ is even.
1d
answered Prove that $2^{3^n} + 1$ is divisible by 9, for $n\ge1$
2d
revised Parametrization of the ellipse $\frac {x^2} {p^2} + \frac {y^2} {q^2} = 1$.
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2d
comment Parametrization of the ellipse $\frac {x^2} {p^2} + \frac {y^2} {q^2} = 1$.
@Nicolas, see my edited answer.
2d
revised Parametrization of the ellipse $\frac {x^2} {p^2} + \frac {y^2} {q^2} = 1$.
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2d
comment To show module homomorphism being injective
@Kyson, see my edited answer.
2d
revised To show module homomorphism being injective
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2d
revised To show module homomorphism being injective
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2d
answered Parametrization of the ellipse $\frac {x^2} {p^2} + \frac {y^2} {q^2} = 1$.
2d
answered To show module homomorphism being injective
2d
answered Matrices that commute with all matrices