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| Description: Subset theorem for image. Exercise 22(a) of [Enderton] p. 53. |
| Ref | Expression |
|---|---|
| imass2 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ssres2 4240 |
. . 3
| |
| 2 | rnss 4189 |
. . 3
| |
| 3 | 1, 2 | syl 12 |
. 2
|
| 4 | df-ima 4007 |
. 2
| |
| 5 | df-ima 4007 |
. 2
| |
| 6 | 3, 4, 5 | 3sstr4g 2658 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: funimass1 4491 funimass2 4492 fvimacnv 4778 sbthlem1 5510 sbthlem2 5511 php3 5609 ordtypelem6 5689 cnpco 9046 cnconst 9057 filrn 10293 elfilmap2 10313 axfelem10 14040 conttnf 14944 iscnp3 14946 lvsovso 15038 ordtypelem6OLD 15380 cnntr 15420 cnsubsp2 15427 compfipin0lem 15435 cnpfillim 15589 fmfnfmlem1 15594 flimfbas 15601 ismtyhmeolem 15950 heiborlem12 15966 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 1304 ax-gen 1305 ax-8 1306 ax-9 1307 ax-10 1308 ax-11 1309 ax-12 1310 ax-14 1312 ax-17 1317 ax-4 1319 ax-5o 1321 ax-6o 1324 ax-9o 1481 ax-10o 1500 ax-16 1580 ax-11o 1588 ax-ext 1865 ax-sep 3438 ax-nul 3445 ax-pow 3481 ax-pr 3524 |
| This theorem depends on definitions: df-bi 164 df-or 241 df-an 242 df-ex 1327 df-sb 1536 df-eu 1775 df-mo 1776 df-clab 1872 df-cleq 1877 df-clel 1880 df-ne 2019 df-v 2294 df-dif 2597 df-un 2600 df-in 2603 df-ss 2605 df-nul 2876 df-pw 3035 df-sn 3049 df-pr 3050 df-op 3053 df-br 3339 df-opab 3396 df-xp 4000 df-rel 4001 df-cnv 4002 df-dm 4004 df-rn 4005 df-res 4006 df-ima 4007 |