group_properties:> isGroup pregroup
}.
-interpretation "Group inverse" 'invert x = (inv _ x).
+interpretation "Group inverse" 'invert x = (inv ? x).
definition left_cancellable ≝
λT:Type. λop: T -> T -> T.
for @{ 'subgroupimage $H $x }.
interpretation "Subgroup image" 'subgroupimage H x =
- (image _ _ (morphism_OF_subgroup _ H) x).
+ (image ?? (morphism_OF_subgroup ? H) x).
definition member_of_subgroup ≝
λG.λH:subgroup G.λx:G.∃y.x=y \sub H.
for @{ 'not_member_of $x $H }.
interpretation "Member of subgroup" 'member_of x H =
- (member_of_subgroup _ H x).
+ (member_of_subgroup ? H x).
interpretation "Not member of subgroup" 'not_member_of x H =
- (Not (member_of_subgroup _ H x)).
+ (Not (member_of_subgroup ? H x)).
(* Left cosets *)
(* Here I would prefer 'magma_op, but this breaks something in the next definition *)
interpretation "Left_coset" 'times x C =
- (mk_left_coset _ x C).
+ (mk_left_coset ? x C).
definition member_of_left_coset ≝
λG:Group.λC:left_coset G.λx:G.
∃y.x=(element ? C)·y \sub (subgrp ? C).
interpretation "Member of left_coset" 'member_of x C =
- (member_of_left_coset _ C x).
+ (member_of_left_coset ? C x).
definition left_coset_eq ≝
λG.λC,C':left_coset G.
for @{ 'disjoint $a $b }.
interpretation "Left cosets disjoint" 'disjoint C C' =
- (left_coset_disjoint _ C C').
+ (left_coset_disjoint ? C C').
(* The following should be a one-shot alias! *)
alias symbol "member_of" (instance 0) = "Member of subgroup".