Metamath Proof Explorer


Theorem zpnn0elfzo1

Description: Membership of an integer increased by a nonnegative integer in a half- open integer range. (Contributed by Alexander van der Vekens, 22-Sep-2018)

Ref Expression
Assertion zpnn0elfzo1 ⊢ Z ∈ ℤ ∧ N ∈ ℕ 0 → Z + N ∈ Z ..^ Z + N + 1

Proof

Step Hyp Ref Expression
1 zpnn0elfzo ⊢ Z ∈ ℤ ∧ N ∈ ℕ 0 → Z + N ∈ Z ..^ Z + N + 1
2 zcn ⊢ Z ∈ ℤ → Z ∈ ℂ
3 2 adantr ⊢ Z ∈ ℤ ∧ N ∈ ℕ 0 → Z ∈ ℂ
4 nn0cn ⊢ N ∈ ℕ 0 → N ∈ ℂ
5 4 adantl ⊢ Z ∈ ℤ ∧ N ∈ ℕ 0 → N ∈ ℂ
6 1cnd ⊢ Z ∈ ℤ ∧ N ∈ ℕ 0 → 1 ∈ ℂ
7 3 5 6 addassd ⊢ Z ∈ ℤ ∧ N ∈ ℕ 0 → Z + N + 1 = Z + N + 1
8 7 oveq2d ⊢ Z ∈ ℤ ∧ N ∈ ℕ 0 → Z ..^ Z + N + 1 = Z ..^ Z + N + 1
9 1 8 eleqtrd ⊢ Z ∈ ℤ ∧ N ∈ ℕ 0 → Z + N ∈ Z ..^ Z + N + 1