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Topological defects and generalised orbifolds ... - Nils Carqueville

Topological defects and generalised orbifolds ... - Nils Carqueville

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Diagrammatics in bicategories<br />

X<br />

X<br />

= 1X<br />

φ<br />

Z<br />

X Y<br />

ϕ<br />

Y<br />

X<br />

= ϕ : X −→ Y<br />

= φ : X ⊗ Y −→ Z<br />

ψ<br />

ϕ<br />

Z<br />

X<br />

ρX<br />

= ψϕ<br />

X<br />

X I<br />

X<br />

X<br />

Y<br />

φ ′ φ = φ⊗φ′<br />

Y

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