| count(A[n], mkbag(A, i)) - (count(A[n], mkbag(A, i)) = 0 ⊃ 0;1) - (count(A[n], mkbag(A, i)) - (count(A[n], mkbag(A, i)) = 0 ⊃ 0;1) = 0 ⊃ 0;1) = 0, A[m] = A[n], A[n0] = A[n], n0 < # A, n < # A, m < # A, n0 < i, n < i, m < i, i ≤ # A ⊦ n = m, n = n0, n0 = m |
count(A[n], mkbag(A, i)) - 0 - (count(A[n], mkbag(A, i)) - (count(A[n], mkbag(A, i)) = 0 ⊃ 0;1) = 0 ⊃ 0;1) = 0, A[n0] = A[n], A[m] = A[n], count(A[n], mkbag(A, i)) = 0, m < i, n < i, n0 < i, m < # A, n < # A, n0 < # A, i ≤ # A ⊦ n = n0, n = m, n0 = m
count(A[n], mkbag(A, i)) - 1 - (count(A[n], mkbag(A, i)) - (count(A[n], mkbag(A, i)) = 0 ⊃ 0;1) = 0 ⊃ 0;1) = 0, A[n0] = A[n], A[m] = A[n], m < i, n < i, n0 < i, m < # A, n < # A, n0 < # A, i ≤ # A ⊦ count(A[n], mkbag(A, i)) = 0, n = n0, n = m, n0 = m