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| Mirrors > Home > MPE Home > Th. List > 0ngrp | Structured version Visualization version GIF version | ||
| Description: The empty set is not a group. (Contributed by NM, 25-Apr-2007.) (New usage is discouraged.) |
| Ref | Expression |
|---|---|
| 0ngrp | ⊢ ¬ ∅ ∈ GrpOp |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | neirr 2941 | . 2 ⊢ ¬ ∅ ≠ ∅ | |
| 2 | rn0 5875 | . . . 4 ⊢ ran ∅ = ∅ | |
| 3 | 2 | eqcomi 2745 | . . 3 ⊢ ∅ = ran ∅ |
| 4 | 3 | grpon0 30577 | . 2 ⊢ (∅ ∈ GrpOp → ∅ ≠ ∅) |
| 5 | 1, 4 | mto 197 | 1 ⊢ ¬ ∅ ∈ GrpOp |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ∈ wcel 2113 ≠ wne 2932 ∅c0 4285 ran crn 5625 GrpOpcgr 30564 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2184 ax-ext 2708 ax-sep 5241 ax-nul 5251 ax-pr 5377 ax-un 7680 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-ral 3052 df-rex 3061 df-rab 3400 df-v 3442 df-sbc 3741 df-csb 3850 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-nul 4286 df-if 4480 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-iun 4948 df-br 5099 df-opab 5161 df-mpt 5180 df-id 5519 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-fo 6498 df-fv 6500 df-ov 7361 df-grpo 30568 |
| This theorem is referenced by: vsfval 30708 zrdivrng 38150 |
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