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visits member for 2 years, 8 months
seen Dec 10 at 20:40

Dec
5
comment Using set notation, define the set of even natural numbers between 100 and 500.
@rubik That would be union, and that is not at all what is meant in the post.
Dec
5
comment Using set notation, define the set of even natural numbers between 100 and 500.
Is the addition of sets a commonly accepted notation? What would $\{a,b\}+\{c,d\}$ result in?
Dec
3
comment Is there a shape with infinite area but finite perimeter?
How about $\Bbb R^2$? Zero perimeter, infinite area.
Aug
13
comment Is this group isomorphic to $S_n\times Z_m^n$?
I think it's a good idea to link this here: Generalized symmetric group
Aug
7
awarded  Quorum
Aug
7
comment Why is multiplication axiomatized?
@JyrkiLahtonen Matrix multiplication is a different matter, in my question I was thinking of real multiplication only.
Aug
7
asked Why is multiplication axiomatized?
Jul
30
accepted Is this group isomorphic to $S_n\times Z_m^n$?
Jul
27
asked Is this group isomorphic to $S_n\times Z_m^n$?
Jul
26
comment What are some conceptualizations that work in mathematics but are not strictly true?
@Jik A triangle between three distant stars will also have an angle sum different from 180 degrees. However, I think that this answer is misleading, because the geometric principle is mathematically true - only that kind of geometry does not work on astronomical scales.
Jul
26
comment Is $\frac{\textrm{d}y}{\textrm{d}x}$ not a ratio?
"...just as $dx$ is not a product." You can get $dx$ by applying the $d$ operator on the $x$ differential form, and as such $dx$ is a group operation, so I think you have the right to call it a product.
Jul
25
accepted Shortest p-distance
Jul
24
asked Shortest p-distance
Jul
2
awarded  Curious
Apr
15
awarded  Yearling
Feb
17
awarded  Critic
Feb
17
asked Condition to sum of geometric series
Dec
19
asked Half Laplace operator
Nov
2
accepted Unprovable unprovability of $\forall x\in X:P(x)$
Nov
1
asked Unprovable unprovability of $\forall x\in X:P(x)$