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The Logic of Quantum Mechanics - take II - Perimeter Institute

The Logic of Quantum Mechanics - take II - Perimeter Institute

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— commutative Frobenius algebras —<br />

A commutative monoid is a set X with a binary map<br />

µ : X × X → X<br />

which is commutative, associative and unital i.e<br />

µ◦(µ×1 X ) = µ◦(1 X ×µ) µ = µ◦σ µ◦(1 X ×e) = 1 X<br />

with:<br />

σ : X × X → X × X :: (a, b) ↦→ (b, a)<br />

e : {∗} → X :: ∗ ↦→ 1

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