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Gauge Freedom<br />
We say that a pair of monads are equivalent if there is a commuting diagram<br />
H ⊗ A(C4 )<br />
⏐<br />
U⊗id<br />
H ⊗ A(C 4 )<br />
σz<br />
−−−−→ K ⊗ A(C4 )<br />
⏐<br />
W ⊗id<br />
˜σz<br />
−−−−→ K ⊗ A(C 4 )<br />
for invertible linear maps U : H → H and W : K → K. The effect on the resulting<br />
projection is to map P ↦→ W P W ∗ .<br />
S. Brain (RU) NCG of Self-Dual Gauge Fields Nijmegen, 12th October 2010 9 / 25