[Imprint][Data Privacy Statement][E-Mail]

View long theorem info. View the proof. Back to main index. View the specification. View theorem base summary, View theorem base listing, the used properties by spec, the dependency list, the symbol table,

Proof step 8 from proof infinite-append-lem (previous step)

ii(0) = 0, ∀ m. m < n0 → ii(m + 1) = ii(m) + # lf(m) ∧ (nf from ii(m)) to # lf(m) = lf(m) ∧ (∀ m0. m0 ≤ m → ii(m0) ≤ ii(m)) ⊦ ∃ nf, ii. ii(0) = 0 ∧ (∀ m. ¬ n0 < m → ii(m + 1) = ii(m) + # lf(m) ∧ (nf from ii(m)) to # lf(m) = lf(m) ∧ (∀ m0. m0 ≤ m → ii(m0) ≤ ii(m)))

User applied rule exists right

And obtained the following new goals

Proof step 9:
ii(0) = 0, ∀ m. m < n0 → ii(m + 1) = ii(m) + # lf(m) ∧ (nf from ii(m)) to # lf(m) = lf(m) ∧ (∀ m0. m0 ≤ m → ii(m0) ≤ ii(m)) ⊦ (0 = n0 + 1 ⊃ ii(n0) + # lf(n0);ii(0)) = 0 ∧ (∀ m. ¬ n0 < m → (m + 1 = n0 + 1 ⊃ ii(n0) + # lf(n0);ii(m + 1)) = (m = n0 + 1 ⊃ ii(n0) + # lf(n0);ii(m)) + # lf(m) ∧ ((λ n. (n < ii(n0) + # lf(n0) ∧ ¬ n < ii(n0) ⊃ lf(n0)[n - ii(n0)];nf(n))) from (m = n0 + 1 ⊃ ii(n0) + # lf(n0);ii(m))) to # lf(m) = lf(m) ∧ (∀ m0. m0 ≤ m → (m0 = n0 + 1 ⊃ ii(n0) + # lf(n0);ii(m0)) ≤ (m = n0 + 1 ⊃ ii(n0) + # lf(n0);ii(m))))

Rule argument

pos: right 1 terms: λ n. (n < ii(n0) + # lf(n0) ∧ ¬ n < ii(n0) ⊃ lf(n0)[n - ii(n0)] ;nf(n) ), λ n. (n = n0 + 1 ⊃ ii(n0) + # lf(n0);ii(n)) abort: F discard: T computed: F

Additional information

Used terms: λ n. (n < ii(n0) + # lf(n0) ∧ ¬ n < ii(n0) ⊃ lf(n0)[n - ii(n0)];nf(n)), λ n. (n = n0 + 1 ⊃ ii(n0) + # lf(n0);ii(n))