| ⊦ a = b, stng[b, d0][a, d][a0] = stng[a, d][b, d0][a0] |
⊦ a ≠ b → stng[b, d][a] = stng[a]
a0 ≠ a ⊦ a = b, stng[b, d0][a0] = stng[a, d][b, d0][a0]
Used simplifier rules: At-same: ⊦ stng[a, d][a] = d;%At-other: ⊦ a ≠ b → stng[b, d][a] = stng[a]; Used terms: a0, d, a, stng[b, d0]