In "The Algebra of Grand Unified Theories" http://arxiv.org/abs/0904.1556" [Broken] john Baez (see page nb 9) shows how the conservation of eigenvalues (T3 isospin)(adsbygoogle = window.adsbygoogle || []).push({});

appears if there is an intertwiner between the representation spaces of the symmetry group.

I discovered intertwiners for the first time in LQG (in this forum).

Can one avoid lagrangians to explain conservation laws with them?

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# How are intertwinners related to conservation laws?

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