Logic.and_intro: def of bend-collections-laws-math@1.0.0.0
Import: import bend-collections-laws-math@1.0.0.0/proofs/lib/logic.bend as Logic
Lines 33-35 of bend-collections-laws-math@1.0.0.0/proofs/lib/logic.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-math@1.0.0.0/proofs/lib/logic.bend&start_line=33&end_line=35

import Base

def and_intro(a: Bool, b: Bool, ea: {a == True{} : Bool}, eb: {b == True{} : Bool}) -> {Bool.and(a, b) == True{} : Bool}:
  %Equal.sym(Bool, a, True{}, ea) : {Bool.and(_, b) == True{} : Bool}
  eb

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Equal.sym