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| Description: Corollary of Pigeonhole Principle. |
| Ref | Expression |
|---|---|
| php2 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eleq1 1581 |
. . . . 5
| |
| 2 | psseq2 2187 |
. . . . 5
| |
| 3 | 1, 2 | anbi12d 639 |
. . . 4
|
| 4 | breq2 2678 |
. . . 4
| |
| 5 | 3, 4 | imbi12d 637 |
. . 3
|
| 6 | pssss 2194 |
. . . . . . 7
| |
| 7 | visset 1860 |
. . . . . . . 8
| |
| 8 | ssdom2g 4470 |
. . . . . . . 8
| |
| 9 | 7, 8 | ax-mp 7 |
. . . . . . 7
|
| 10 | 6, 9 | syl 10 |
. . . . . 6
|
| 11 | 10 | adantl 397 |
. . . . 5
|
| 12 | php 4578 |
. . . . . 6
| |
| 13 | 7 | ensym 4473 |
. . . . . 6
|
| 14 | 12, 13 | nsyl 122 |
. . . . 5
|
| 15 | 11, 14 | jca 295 |
. . . 4
|
| 16 | brsdom 4442 |
. . . 4
| |
| 17 | 15, 16 | sylibr 207 |
. . 3
|
| 18 | 5, 17 | vtoclg 1894 |
. 2
|
| 19 | 18 | anabsi5 506 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: php4 4581 nndomo 4585 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 1003 ax-gen 1004 ax-8 1005 ax-9 1006 ax-10 1007 ax-11 1008 ax-12 1009 ax-13 1010 ax-14 1011 ax-17 1012 ax-4 1014 ax-5o 1016 ax-6o 1019 ax-9o 1164 ax-10o 1182 ax-16 1252 ax-11o 1260 ax-ext 1504 ax-rep 2748 ax-sep 2758 ax-nul 2765 ax-pow 2798 ax-pr 2835 ax-un 2922 |
| This theorem depends on definitions: df-bi 154 df-or 231 df-an 232 df-3or 788 df-3an 789 df-ex 1022 df-sb 1214 df-eu 1424 df-mo 1425 df-clab 1510 df-cleq 1515 df-clel 1518 df-ne 1634 df-ral 1696 df-rex 1697 df-v 1859 df-dif 2100 df-un 2101 df-in 2102 df-ss 2104 df-pss 2106 df-nul 2332 df-if 2414 df-pw 2454 df-sn 2464 df-pr 2465 df-tp 2467 df-op 2468 df-uni 2558 df-br 2675 df-opab 2722 df-tr 2736 df-eprel 2888 df-id 2891 df-po 2896 df-so 2906 df-fr 2974 df-we 2991 df-ord 3008 df-on 3009 df-lim 3010 df-suc 3011 df-om 3189 df-xp 3241 df-rel 3242 df-cnv 3243 df-co 3244 df-dm 3245 df-rn 3246 df-res 3247 df-ima 3248 df-fun 3249 df-fn 3250 df-f 3251 df-f1 3252 df-fo 3253 df-f1o 3254 df-fv 3255 df-er 4319 df-en 4429 df-dom 4430 df-sdom 4431 |