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15h
revised Examples of continuous non-transitive group actions
added 29 characters in body
15h
comment Examples of continuous non-transitive group actions
Ooops, I'll fix that.
15h
asked Examples of continuous non-transitive group actions
Jul
21
comment Tensor product of duals
Yes, but I've only seen $V \sim V^*$ proven using dual bases.
Jul
21
comment Tensor product of duals
How do you prove $V \simeq V^*$ without referring to the basis of $V$?
Jul
21
comment Tensor product of duals
And what in the case when V is finite-dimensional, but W isn't?
Jul
21
asked Tensor product of duals
Jul
2
awarded  Curious
Jul
2
awarded  Inquisitive
Jun
16
awarded  Yearling
May
28
comment Left ideals in exterior algebra $\Lambda E$ that aren't right
What is the easiest way to show $(a+bc)d \not \in I$?
May
28
accepted Left ideals in exterior algebra $\Lambda E$ that aren't right
May
28
comment Left ideals in exterior algebra $\Lambda E$ that aren't right
I absentmindedly accepted your answer because I thought it will be an example from your comment. But this one doesn't work: $(1-a)(1+a) = 1 + a - a - a^2 = 1$, so the left ideal generated by $1 + a$ is the entire $\Lambda E$...
May
28
asked Left ideals in exterior algebra $\Lambda E$ that aren't right
May
17
accepted Is every commutative simple ring a field?
May
17
comment Is every commutative simple ring a field?
@user35603 Yeah, I worded it clumsily. I thought about the case where we don't know if rings has a unity a priori... But there is a chance that being simple forces a ring to have unity, that's what I'm interested in.
May
17
revised Is every commutative simple ring a field?
error
May
17
asked Is every commutative simple ring a field?
May
11
accepted Do continuous functions preserve limit point compactness when the spaces are Hausdorff?
May
11
accepted How to digest new math more quickly?