 Witten SU(2) anomaly (source code)

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= Witten SU(2) anomaly
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{wiki=Global_anomaly}

The Witten SU(2) anomaly is a four-dimensional global gauge anomaly present for an odd number of left-handed Weyl fermion doublets. A consistent SU(2) gauge theory must have an even number modulo the corresponding representation index.

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