List questions from index-notation

Published on 26 Mar 2026 - 19:07

162

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The proof of a tensor cross product identity

Published on 08 Apr 2026 - 23:05

37

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Reason why $\sum_{j=0}^{\infty} \sum_{k=0}^j a_{k,j-k} =\sum_{j=0}^{+\infty} \sum_{k=0}^{\infty} a_{k,j}$

Published on 26 Mar 2026 - 17:32

27

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Is the tensor $T^{i}_{\;j}{}^{\,k}$ the same as the tensor $T^{ik}_{\;\;j}$, and why would it be written as the former, if so?

Published on 26 Mar 2026 - 16:07

45

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Indexed summation and product

Published on 14 Apr 2026 - 17:14

535

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Mathematical notation: Select indexes from an ordered set of numbers

Published on 26 Apr 2026 - 0:52

41

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Sigma Summation - Several Lower Indices

Published on 26 Mar 2026 - 16:10

73

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Concrete Mathematics Warmup 4: Expanding a Triple Sum

Published on 26 Mar 2026 - 16:05

59

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Meaning of "plus" ($+$) index

Published on 25 Apr 2026 - 19:11

150

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Conceitual difference between $\delta_{ij}$ and $\delta^i_j$

Published on 10 May 2026 - 17:59

87

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Show that $f$ is a Schwartz function if and only if $|\partial^\alpha \phi(x)| \leq C_{\alpha ,N}(1+|x|)^{-N} $

Published on 26 Mar 2026 - 5:56

414

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sigma notation- squaring the entire sum

Published on 26 Mar 2026 - 16:03

136

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What does $\sum_{i\in I}a_i x_i$ look like when $I=\emptyset$?

Published on 26 Mar 2026 - 16:05

272

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$\nabla_a \nabla_b v^c$ abstract index notation

Published on 26 Apr 2026 - 12:03

55

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At most one positive entry in each column: How to write this in a mathematical way?

Published on 26 Mar 2026 - 16:05

List Question

The proof of this tensor identity

The proof of a tensor cross product identity

Reason why $\sum_{j=0}^{\infty} \sum_{k=0}^j a_{k,j-k} =\sum_{j=0}^{+\infty} \sum_{k=0}^{\infty} a_{k,j}$

Is the tensor $T^{i}_{\;j}{}^{\,k}$ the same as the tensor $T^{ik}_{\;\;j}$, and why would it be written as the former, if so?

Indexed summation and product

Mathematical notation: Select indexes from an ordered set of numbers

Sigma Summation - Several Lower Indices

Concrete Mathematics Warmup 4: Expanding a Triple Sum

Meaning of "plus" ($+$) index

Conceitual difference between $\delta_{ij}$ and $\delta^i_j$

Show that $f$ is a Schwartz function if and only if $|\partial^\alpha \phi(x)| \leq C_{\alpha ,N}(1+|x|)^{-N} $

sigma notation- squaring the entire sum

What does $\sum_{i\in I}a_i x_i$ look like when $I=\emptyset$?

$\nabla_a \nabla_b v^c$ abstract index notation

At most one positive entry in each column: How to write this in a mathematical way?

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