Theorem nn0xnn0 12605

Description: A standard nonnegative integer is an extended nonnegative integer. (Contributed by AV, 10-Dec-2020.)

Assertion

Ref	Expression
nn0xnn0	⊢ (𝐴 ∈ ℕ0 → 𝐴 ∈ ℕ0*)

Proof of Theorem nn0xnn0

Step	Hyp	Ref	Expression
1		nn0ssxnn0 12604	. 2 ⊢ ℕ0 ⊆ ℕ0*
2	1	sseli 3927	1 ⊢ (𝐴 ∈ ℕ0 → 𝐴 ∈ ℕ0*)

This proof depends on syntax axioms:   → wi 4   ∈ wcel 2145  ℕ₀cn0 12528  ℕ₀^*cxnn0 12601

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2732

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-tru 1573  df-ex 1813  df-sb 2100  df-clab 2739  df-cleq 2752  df-clel 2835  df-v 3452  df-un 3904  df-ss 3916  df-xnn0 12602

This theorem is used by:  xnn0xadd0  13299  wlk1ewlk  30099  frgrregorufrg  30806  usgrcyclgt2v  35724