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Jan
12
accepted Van Kampen theorem application in a simple three-holed figure
Jan
12
comment Van Kampen theorem application in a simple three-holed figure
OK, thanks this gets clearer now !
Jan
11
comment Van Kampen theorem application in a simple three-holed figure
So for example the words $a_2 a_1 b_2 a_2$ and $b_1 a_1 b_2 b_1$ belong to the same quotient group. What is the element $n$ of $N$ so that $a_2 a_1 b_2 a_2 + n = b_1 a_1 b_2 b_1$ ?
Jan
10
asked Van Kampen theorem application in a simple three-holed figure
Jan
10
awarded  Popular Question
Nov
30
accepted Interpretation of $d\phi(z)$ in differential geometry
Nov
29
revised Interpretation of $d\phi(z)$ in differential geometry
added 155 characters in body
Nov
28
revised Interpretation of $d\phi(z)$ in differential geometry
edited body
Nov
27
revised Interpretation of $d\phi(z)$ in differential geometry
added 16 characters in body
Nov
27
revised Interpretation of $d\phi(z)$ in differential geometry
deleted 1 character in body
Nov
27
asked Interpretation of $d\phi(z)$ in differential geometry
Oct
13
comment Divergence as trace of Levi-Civita connection
Precisely ! Thank you !
Sep
30
accepted Divergence as trace of Levi-Civita connection
Sep
30
comment Divergence as trace of Levi-Civita connection
Thank you for the clarification on the differential vs algebraic operators. Isn't the tensor a $(n,n)$-tensor ?
Sep
30
revised Divergence as trace of Levi-Civita connection
deleted 1 character in body
Sep
29
comment Divergence as trace of Levi-Civita connection
That is, I do not understand what is the tensorial expression of the operator $Y \rightarrow D_Y X$.
Sep
29
revised Divergence as trace of Levi-Civita connection
added 7 characters in body
Sep
29
comment Divergence as trace of Levi-Civita connection
I understand that the trace is a scalar field. What I do not understand is what is the tensor field from which the trace is computed at each point.
Sep
29
asked Divergence as trace of Levi-Civita connection
Sep
4
accepted Nilpotent ideal and ring homomorphism