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| Description: Lemma for sbth 4437. |
| Ref | Expression |
|---|---|
| sbthlem.1 |
|
| sbthlem.2 |
|
| Ref | Expression |
|---|---|
| sbthlem1 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | unissb 2518 |
. 2
| |
| 2 | sbthlem.2 |
. . . . 5
| |
| 3 | 2 | abeq2i 1562 |
. . . 4
|
| 4 | ssconb 2160 |
. . . . . . . . 9
| |
| 5 | 4 | biimprd 154 |
. . . . . . . 8
|
| 6 | 5 | ex 373 |
. . . . . . 7
|
| 7 | difss 2157 |
. . . . . . . 8
| |
| 8 | sstr2 2061 |
. . . . . . . 8
| |
| 9 | 7, 8 | mpi 44 |
. . . . . . 7
|
| 10 | 6, 9 | syl5 21 |
. . . . . 6
|
| 11 | 10 | pm2.43d 65 |
. . . . 5
|
| 12 | 11 | imp 350 |
. . . 4
|
| 13 | 3, 12 | sylbi 199 |
. . 3
|
| 14 | elssuni 2516 |
. . . . 5
| |
| 15 | imass2 3417 |
. . . . 5
| |
| 16 | sscon 2161 |
. . . . 5
| |
| 17 | 14, 15, 16 | 3syl 20 |
. . . 4
|
| 18 | imass2 3417 |
. . . 4
| |
| 19 | sscon 2161 |
. . . 4
| |
| 20 | 17, 18, 19 | 3syl 20 |
. . 3
|
| 21 | 13, 20 | sstrd 2064 |
. 2
|
| 22 | 1, 21 | mprgbir 1693 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: sbthlem2 4428 sbthlem3 4429 sbthlem5 4431 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 959 ax-gen 960 ax-8 961 ax-10 963 ax-11 964 ax-12 965 ax-13 966 ax-14 967 ax-17 968 ax-4 970 ax-5o 972 ax-6o 975 ax-9o 1119 ax-10o 1136 ax-16 1206 ax-11o 1213 ax-ext 1452 ax-sep 2693 ax-pow 2732 ax-pr 2769 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 978 df-sb 1168 df-eu 1375 df-mo 1376 df-clab 1457 df-cleq 1462 df-clel 1465 df-ne 1579 df-ral 1641 df-v 1803 df-dif 2039 df-un 2040 df-in 2041 df-ss 2043 df-nul 2271 df-pw 2392 df-sn 2402 df-pr 2403 df-op 2406 df-uni 2494 df-br 2610 df-opab 2657 df-xp 3174 df-rel 3175 df-cnv 3176 df-dm 3178 df-rn 3179 df-res 3180 df-ima 3181 |