Theorem undefnel 8321

Description: The undefined value generated from a set is not a member of the set. (Contributed by NM, 15-Sep-2011.)

Assertion

Ref	Expression
undefnel	⊢ (𝑆 ∈ 𝑉 → (Undef‘𝑆) ∉ 𝑆)

Proof of Theorem undefnel

Step	Hyp	Ref	Expression
1		undefnel2 8320	. 2 ⊢ (𝑆 ∈ 𝑉 → ¬ (Undef‘𝑆) ∈ 𝑆)
2		df-nel 3066	. 2 ⊢ ((Undef‘𝑆) ∉ 𝑆 ↔ ¬ (Undef‘𝑆) ∈ 𝑆)
3	1, 2	sylibr 237	1 ⊢ (𝑆 ∈ 𝑉 → (Undef‘𝑆) ∉ 𝑆)

This proof depends on syntax axioms:  ¬ wn 3   → wi 4   ∈ wcel 2147   ∉ wnel 3065  ‘cfv 6555  Undefcund 8314

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 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-sep 5252  ax-pow 5331  ax-pr 5395  ax-un 7772

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-nel 3066  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-br 5107  df-opab 5171  df-mpt 5190  df-id 5550  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-iota 6509  df-fun 6557  df-fv 6563  df-undef 8315

This theorem is used by: (None)