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Mirrors > Home > MPE Home > Th. List > 4cyclusnfrgr | Structured version Visualization version Unicode version |
Description: A graph with a 4-cycle is not a friendhip graph. (Contributed by Alexander van der Vekens, 19-Dec-2017.) (Revised by AV, 2-Apr-2021.) |
Ref | Expression |
---|---|
4cyclusnfrgr.v | Vtx |
4cyclusnfrgr.e | Edg |
Ref | Expression |
---|---|
4cyclusnfrgr | USGraph FriendGraph |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simprl 794 | . . . . . 6 USGraph | |
2 | simprr 796 | . . . . . 6 USGraph | |
3 | simpl3 1066 | . . . . . 6 USGraph | |
4 | 4cycl2vnunb 27154 | . . . . . 6 | |
5 | 1, 2, 3, 4 | syl3anc 1326 | . . . . 5 USGraph |
6 | 4cyclusnfrgr.v | . . . . . . . . . 10 Vtx | |
7 | 4cyclusnfrgr.e | . . . . . . . . . 10 Edg | |
8 | 6, 7 | frcond1 27130 | . . . . . . . . 9 FriendGraph |
9 | pm2.24 121 | . . . . . . . . 9 FriendGraph | |
10 | 8, 9 | syl6com 37 | . . . . . . . 8 FriendGraph FriendGraph |
11 | 10 | 3ad2ant2 1083 | . . . . . . 7 USGraph FriendGraph FriendGraph |
12 | 11 | com23 86 | . . . . . 6 USGraph FriendGraph FriendGraph |
13 | 12 | adantr 481 | . . . . 5 USGraph FriendGraph FriendGraph |
14 | 5, 13 | mpd 15 | . . . 4 USGraph FriendGraph FriendGraph |
15 | 14 | pm2.01d 181 | . . 3 USGraph FriendGraph |
16 | df-nel 2898 | . . 3 FriendGraph FriendGraph | |
17 | 15, 16 | sylibr 224 | . 2 USGraph FriendGraph |
18 | 17 | ex 450 | 1 USGraph FriendGraph |
Colors of variables: wff setvar class |
Syntax hints: wn 3 wi 4 wa 384 w3a 1037 wceq 1483 wcel 1990 wne 2794 wnel 2897 wreu 2914 wss 3574 cpr 4179 cfv 5888 Vtxcvtx 25874 Edgcedg 25939 USGraph cusgr 26044 FriendGraph cfrgr 27120 |
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-nul 4789 |
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-nel 2898 df-ral 2917 df-rex 2918 df-reu 2919 df-rmo 2920 df-rab 2921 df-v 3202 df-sbc 3436 df-csb 3534 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-sn 4178 df-pr 4180 df-op 4184 df-uni 4437 df-br 4654 df-iota 5851 df-fv 5896 df-frgr 27121 |
This theorem is referenced by: frgrnbnb 27157 frgrwopreg 27187 |
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