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| Description: Corollary of Pigeonhole Principle. |
| Ref | Expression |
|---|---|
| php2 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eleq1 1532 |
. . . . 5
| |
| 2 | psseq2 2133 |
. . . . 5
| |
| 3 | 1, 2 | anbi12d 627 |
. . . 4
|
| 4 | breq2 2619 |
. . . 4
| |
| 5 | 3, 4 | imbi12d 625 |
. . 3
|
| 6 | pssss 2140 |
. . . . . . 7
| |
| 7 | visset 1810 |
. . . . . . . 8
| |
| 8 | ssdom2g 4399 |
. . . . . . . 8
| |
| 9 | 7, 8 | ax-mp 7 |
. . . . . . 7
|
| 10 | 6, 9 | syl 10 |
. . . . . 6
|
| 11 | 10 | adantl 388 |
. . . . 5
|
| 12 | php 4502 |
. . . . . 6
| |
| 13 | 7 | ensym 4402 |
. . . . . 6
|
| 14 | 12, 13 | nsyl 116 |
. . . . 5
|
| 15 | 11, 14 | jca 288 |
. . . 4
|
| 16 | brsdom 4372 |
. . . 4
| |
| 17 | 15, 16 | sylibr 200 |
. . 3
|
| 18 | 5, 17 | vtoclg 1844 |
. 2
|
| 19 | 18 | anabsi5 495 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: php4 4505 nndomo 4509 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 961 ax-gen 962 ax-8 963 ax-9 964 ax-10 965 ax-11 966 ax-12 967 ax-13 968 ax-14 969 ax-17 970 ax-4 972 ax-5o 974 ax-6o 977 ax-9o 1122 ax-10o 1139 ax-16 1209 ax-11o 1217 ax-ext 1458 ax-rep 2689 ax-sep 2699 ax-nul 2706 ax-pow 2738 ax-pr 2775 ax-un 2862 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3or 775 df-3an 776 df-ex 980 df-sb 1171 df-eu 1381 df-mo 1382 df-clab 1463 df-cleq 1468 df-clel 1471 df-ne 1585 df-ral 1647 df-rex 1648 df-v 1809 df-dif 2046 df-un 2047 df-in 2048 df-ss 2050 df-pss 2052 df-nul 2278 df-if 2359 df-pw 2399 df-sn 2409 df-pr 2410 df-tp 2412 df-op 2413 df-uni 2500 df-br 2616 df-opab 2663 df-tr 2677 df-eprel 2828 df-id 2831 df-po 2836 df-so 2846 df-fr 2913 df-we 2930 df-ord 2947 df-on 2948 df-lim 2949 df-suc 2950 df-om 3128 df-xp 3180 df-rel 3181 df-cnv 3182 df-co 3183 df-dm 3184 df-rn 3185 df-res 3186 df-ima 3187 df-fun 3188 df-fn 3189 df-f 3190 df-f1 3191 df-fo 3192 df-f1o 3193 df-fv 3194 df-er 4254 df-en 4360 df-dom 4361 df-sdom 4362 |