∀[g:IGroup]. ∀[a,b,c:|g|]. b = c ∈ |g| supposing (a * b) = (a * c) ∈ |g|
{ UnivCD THENA Auto }
1. g : IGroup
2. a : |g|
3. b : |g|
4. c : |g|
5. (a * b) = (a * c) ∈ |g|
⊢ b = c ∈ |g|