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For angular momentum you have

[tex][J_i ,J_j ] = i\hbar \varepsilon _{ijk} J_k [/tex]

and for isospin you have

[tex][t_i,t_j] = ig\varepsilon_{ijk}t_k[/tex]

now, [tex]\hbar[/tex] is viewed as a constant, but [tex]g[/tex] is allowed to change it's value due to renormalization group flow. It seems to me that [tex]\hbar[/tex] can not be a constant then. Where is my reasoning going wrong.

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# The constants of physics not constant

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