in the appendix on Group Theory in Zee's book there is a discussion of commutations for SO(3)(adsbygoogle = window.adsbygoogle || []).push({});

two questions

- does [[itex]J^{ij},J^{lk}] = J^{ij}*J^{lk}-J^{lk}*J^{ij}[/itex]?

and there is an expression in the appendix that the commutator equals i([itex]\delta^{ik}J^{jl} ...[/itex]

i don't understand the why you are multiplying the matrix by the kronecker delta with different upstairs indexes, is not it simply an identity?

**Physics Forums - The Fusion of Science and Community**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Question on tensor notation in group theory

Loading...

Similar Threads - Question tensor notation | Date |
---|---|

A Simple metric tensor question | Aug 14, 2017 |

A Two questions in tensor calc. | Mar 17, 2017 |

Tensor Index Notation Question | Jun 7, 2013 |

Question on generalized inner product in tensor analysis | May 15, 2013 |

Questions regarding tensors | Aug 29, 2010 |

**Physics Forums - The Fusion of Science and Community**