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Theorem 0ngrp 30320
Description: The empty set is not a group. (Contributed by NM, 25-Apr-2007.) (New usage is discouraged.)
Assertion
Ref Expression
0ngrp ¬ ∅ ∈ GrpOp

Proof of Theorem 0ngrp
StepHypRef Expression
1 neirr 2946 . 2 ¬ ∅ ≠ ∅
2 rn0 5928 . . . 4 ran ∅ = ∅
32eqcomi 2737 . . 3 ∅ = ran ∅
43grpon0 30311 . 2 (∅ ∈ GrpOp → ∅ ≠ ∅)
51, 4mto 196 1 ¬ ∅ ∈ GrpOp
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wcel 2099  wne 2937  c0 4323  ran crn 5679  GrpOpcgr 30298
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1790  ax-4 1804  ax-5 1906  ax-6 1964  ax-7 2004  ax-8 2101  ax-9 2109  ax-10 2130  ax-11 2147  ax-12 2167  ax-ext 2699  ax-sep 5299  ax-nul 5306  ax-pr 5429  ax-un 7740
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 847  df-3an 1087  df-tru 1537  df-fal 1547  df-ex 1775  df-nf 1779  df-sb 2061  df-mo 2530  df-eu 2559  df-clab 2706  df-cleq 2720  df-clel 2806  df-nfc 2881  df-ne 2938  df-ral 3059  df-rex 3068  df-rab 3430  df-v 3473  df-sbc 3777  df-csb 3893  df-dif 3950  df-un 3952  df-in 3954  df-ss 3964  df-nul 4324  df-if 4530  df-sn 4630  df-pr 4632  df-op 4636  df-uni 4909  df-iun 4998  df-br 5149  df-opab 5211  df-mpt 5232  df-id 5576  df-xp 5684  df-rel 5685  df-cnv 5686  df-co 5687  df-dm 5688  df-rn 5689  df-iota 6500  df-fun 6550  df-fn 6551  df-f 6552  df-fo 6554  df-fv 6556  df-ov 7423  df-grpo 30302
This theorem is referenced by:  vsfval  30442  zrdivrng  37426
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