Definition mor_of_street_fib_base {B₁ B₂ E₁ E₂ : category} {P₁ : E₁ ⟶ B₁} {P₂ : E₂ ⟶ B₂} (F : mor_of_street_fib P₁ P₂) : B₁ ⟶ B₂ := pr1 F.
Require Import UniMath.Foundations.All. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.Core.Isos. Require Import UniMath.CategoryTheory.Core.Univalence. Require Import UniMath.CategoryTheory.Core.Functors. Require Import UniMath.CategoryTheory.Core.NaturalTransformations. Require Import UniMath.CategoryTheory.DisplayedCats.Core. Require Import UniMath.CategoryTheory.DisplayedCats.Total. Require Import UniMath.CategoryTheory.DisplayedCats.Fibrations.