Theorem cvnref 29150

Description: The covers relation is not reflexive. (Contributed by NM, 26-Jun-2004.) (New usage is discouraged.)

Assertion

Ref	Expression
cvnref	|- ( A e. CH -> -. A <oH A )

Proof of Theorem cvnref

Step	Hyp	Ref	Expression
1		cvnsym 29149	. . 3 |- ( ( A e. CH /\ A e. CH ) -> ( A <oH A -> -. A <oH A ) )
2	1	anidms 677	. 2 |- ( A e. CH -> ( A <oH A -> -. A <oH A ) )
3	2	pm2.01d 181	1 |- ( A e. CH -> -. A <oH A )

Syntax hints:   -. wn 3   -> wi 4   e. wcel 1990   class class class wbr 4653   CHcch 27786   <oH ccv 27821

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pr 4906

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-rex 2918  df-rab 2921  df-v 3202  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184  df-br 4654  df-opab 4713  df-cv 29138

This theorem is referenced by: (None)