Homotopy Type Theory monoidal dagger category > history (Rev #2)



A monoidal dagger category is a dagger category CC with

  • a functor ()():(C×C)C(-)\otimes(-): (C \times C) \to C from the product dagger category of CC to CC itself called the tensor product.

  • an object Ι:Ob(C)\Iota: Ob(C) called the tensor unit.

  • a natural unitary isomorphism type family

α:(()())() ()(()())\alpha: ((-)\otimes(-))\otimes(-) \cong^\dagger (-)\otimes((-)\otimes(-))

called the associator, with dependent terms

α A 1,A 2,A 3:(A 1A 2)A 3 A 1(A 2A 3)\alpha_{A_1, A_2, A_3}: (A_1\otimes A_2)\otimes A_3 \cong^\dagger A_1\otimes(A_2\otimes A_3)
  • a natural unitary isomorphism type family
λ:Ι() ()\lambda: \Iota\otimes(-) \cong^\dagger (-)

called the left unitor, with dependent terms

λ A:ΙA A\lambda_{A}: \Iota\otimes A \cong^\dagger A
  • a natural unitary isomorphism type family
ρ:()Ι ()\rho: (-)\otimes\Iota \cong^\dagger (-)

called the right unitor, with dependent terms

ρ A:AΙ A\rho_{A}: A\otimes\Iota \cong^\dagger A
  • a type family
τ:ρ ()Ι ()=(Ι ()ρ ())α (),Ι,()\tau: \rho_{(-)} \otimes \Iota_{(-)} = (\Iota_{(-)} \otimes \rho_{(-)}) \circ \alpha_{{(-)}, \Iota, {(-)}}

called the triangle identity, with dependent terms

τ A,B:ρ AΙ B=(1 Aρ B)α A,Ι,B\tau_{A, B}: \rho_A \otimes \Iota_B = (1_A \otimes \rho_B) \circ \alpha_{A, \Iota, B}
  • a type family
π:α (),(),()()α ()(),(),()=(id ()α (),(),())α (),()(),()(α (),(),()id ())\pi: \alpha_{(-), (-), (-) \otimes (-)} \circ \alpha_{(-) \otimes (-), (-), (-)} = (id_{(-)} \otimes \alpha_{(-), (-), (-)}) \circ \alpha_{(-), (-) \otimes (-), (-)} \circ (\alpha_{(-), (-), (-)} \otimes id_{(-)})

called the pentagon identity, with dependent terms

π D,E,F,G:α D,E,FGα DE,F,G=(id Dα E,F,G)α D,EF,G(α D,E,Fid G)\pi_{D,E,F,G}: \alpha_{D, E, F \otimes G} \circ \alpha_{D \otimes E, F, G} = (id_D \otimes \alpha_{E, F, G}) \circ \alpha_{D, E \otimes F, G} \circ (\alpha_{D, E, F} \otimes id_G)


See also

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