\( \def\T#1{\bf #1} \def\A#1{\rm #1} \def\K#1{\underline{\bf #1}} \def\Set#1{\cal #1} \def\BSet#1{\boldsymbol{\cal #1}} \def\nmapsto{\mathop{{\not}{\mapsto}}} \)
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Example: anomalies
Example of a bad decomposition (2)
This decomposes into
and