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seen Nov 24 at 17:33

Mar
6
revised For which coverings by “geometrically nice” sets does the nerve admit “Vietoris-Rips-like” approximations?
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Mar
6
asked For which coverings by “geometrically nice” sets does the nerve admit “Vietoris-Rips-like” approximations?
Jun
21
comment $\int f(x) dx $ is appearing as $\int dx f(x)$. Why?
One "justification" I've heard is that if you consider integration as a function taking, say, integrable functions to real number, then writing $\int \mathrm{d}x f$ sort of looks like "applying the function $\int \mathrm{d}x$ to $f$". I don't like the argument myself, but it's one I've heard at least.
Jun
21
comment $\int f(x) dx $ is appearing as $\int dx f(x)$. Why?
It's just notation.
Jun
20
awarded  Critic
Jun
19
comment What is the usefulness of matrices?
Also, if the teacher who couldn't answer your question is the same one who is teaching you about matrices, I would be very skeptical of her and the course.
Jun
19
comment What is the usefulness of matrices?
A matrix is a way to express a linear map between finite-dimensional vector spaces, given a choice of bases for said spaces. Since linear maps are useful, matrices are obviously useful.
May
21
awarded  Editor
May
21
revised Locally closed subspaces and sheaves.
Missing restriction in final formula.
May
21
awarded  Teacher
May
18
answered Locally closed subspaces and sheaves.
May
18
awarded  Commentator
May
18
awarded  Citizen Patrol
May
16
comment Pullback of a locally constant sheaf by a function whose domain is simply connected
No, no problem. I realized my comment was nonsensical. Everything you say is essentially direct.
May
16
awarded  Scholar
May
16
accepted Pullback of a locally constant sheaf by a function whose domain is simply connected
May
16
awarded  Student
May
16
asked Pullback of a locally constant sheaf by a function whose domain is simply connected
Apr
18
comment Is there a way of defining the notion of a variable mathematically?
The word "variable" means many different things, and many of these meanings are non-rigorous. What do you mean by "variable"?
Apr
12
comment Improving my understanding of Cantor's Diagonal Argument
@MooingDuck: I hope I'm not turning this into a chat, but regarding the second question, one thing (probably already pointed out) springs to mind: What do you mean by "the last element" in this infinite sequence?