Let x0 of type ι be given.
Let x1 of type ι be given.
Let x2 of type ι be given.
Let x3 of type ι be given.
Apply unknownprop_6df04587a59e9b54f0549c96144213d94328d0b365474f739b895e743839c817 with
x3,
minus_CSNo x2,
λ x4 x5 . add_CSNo (add_CSNo x0 (add_CSNo x1 x2)) x5 = add_CSNo x0 (add_CSNo x1 x3) leaving 3 subgoals.
The subproof is completed by applying H3.
Apply CSNo_minus_CSNo with
x2.
The subproof is completed by applying H2.
Apply unknownprop_25736a7f92c31e8fd99a310f6c7a28172c5f7a5b698118098169e99d8456d9ea with
x0,
x1,
x2,
x3 leaving 4 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying H1.
The subproof is completed by applying H2.
The subproof is completed by applying H3.