feat(AlgebraicTopology/SimplicialSet/KanComplex): MulStruct.assoc

[joelriou]

---

• depends on: feat(AlgebraicTopology/SimplicialSet): Mulstruct.mulOne and oneMul #38172

[github-actions]

PR summary 6230489fe5

Import changes exceeding 2%

%	File
+2.25%	Mathlib.AlgebraicTopology.SimplicialSet.KanComplex.MulStruct

Import changes for modified files

Dependency changes

File	Base Count	Head Count	Change
Mathlib.AlgebraicTopology.SimplicialSet.KanComplex.MulStruct	976	998	+22 (+2.25%)

Import changes for all files

Files	Import difference
Mathlib.AlgebraicTopology.SimplicialSet.KanComplex.MulStruct	22

---

Declarations diff

+ IsCompatible
+ _root_.Fin.orderIsoPairCompl
+ _root_.Finset.orderIsoOfOrderEmbedding
+ assoc
+ assocAux
+ desc
+ exists_desc
+ exists_lift
+ exists_lift_of_kanComplex
+ facePairComplIso
+ facePairComplIso_hom_ι
+ facePairComplIso_hom_ι'
+ homOfLE_faceSingletonComplIso_inv_eq_facePairComplIso_δ_castPred
+ homOfLE_faceSingletonComplIso_inv_eq_facePairComplIso_δ_pred
+ hom_ext'
+ isCompatible_iff
+ isCompatible_iff_true
+ isCompatible_α
+ lift
+ mulOne
+ multicofork
+ oneMul
+ relStructCastSuccEquivMulStruct
+ relStructSuccEquivMulStruct
+ α
+ α_castSucc_castSucc_castSucc
+ α_castSucc_succ_succ
+ α_of_gt
+ α_of_lt
+ α_succ_succ_succ
+ δ_lift
+ δ_pred_comp
+ ι_desc

You can run this locally as follows

## summary with just the declaration names:
./scripts/pr_summary/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/pr_summary/declarations_diff.sh long <optional_commit>

The doc-module for scripts/pr_summary/declarations_diff.sh contains some details about this script.

---

No changes to technical debt.

You can run this locally as

./scripts/reporting/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

[mathlib-dependent-issues]

This PR/issue depends on:

• feat(AlgebraicTopology/SimplicialSet): Mulstruct.mulOne and oneMul #38172
  By Dependent Issues (🤖). Happy coding!