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Theorem enpr1g 7488
Description:  { A ,  A } has only one element. (Contributed by FL, 15-Feb-2010.)
Assertion
Ref Expression
enpr1g  |-  ( A  e.  V  ->  { A ,  A }  ~~  1o )

Proof of Theorem enpr1g
StepHypRef Expression
1 dfsn2 4001 . 2  |-  { A }  =  { A ,  A }
2 ensn1g 7487 . 2  |-  ( A  e.  V  ->  { A }  ~~  1o )
31, 2syl5eqbrr 4437 1  |-  ( A  e.  V  ->  { A ,  A }  ~~  1o )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    e. wcel 1758   {csn 3988   {cpr 3990   class class class wbr 4403   1oc1o 7026    ~~ cen 7420
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1592  ax-4 1603  ax-5 1671  ax-6 1710  ax-7 1730  ax-8 1760  ax-9 1762  ax-10 1777  ax-11 1782  ax-12 1794  ax-13 1955  ax-ext 2432  ax-sep 4524  ax-nul 4532  ax-pr 4642  ax-un 6485
This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-3an 967  df-tru 1373  df-ex 1588  df-nf 1591  df-sb 1703  df-eu 2266  df-mo 2267  df-clab 2440  df-cleq 2446  df-clel 2449  df-nfc 2604  df-ne 2650  df-ral 2804  df-rex 2805  df-rab 2808  df-v 3080  df-dif 3442  df-un 3444  df-in 3446  df-ss 3453  df-nul 3749  df-if 3903  df-sn 3989  df-pr 3991  df-op 3995  df-uni 4203  df-br 4404  df-opab 4462  df-id 4747  df-suc 4836  df-xp 4957  df-rel 4958  df-cnv 4959  df-co 4960  df-dm 4961  df-rn 4962  df-fun 5531  df-fn 5532  df-f 5533  df-f1 5534  df-fo 5535  df-f1o 5536  df-1o 7033  df-en 7424
This theorem is referenced by:  pr2ne  8286
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