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Mirrors > Home > NFE Home > Th. List > snsspw | Unicode version |
Description: The singleton of a class is a subset of its power class. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
snsspw |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqimss 3323 | . . 3 | |
2 | elsn 3748 | . . 3 | |
3 | df-pw 3724 | . . . 4 | |
4 | 3 | abeq2i 2460 | . . 3 |
5 | 1, 2, 4 | 3imtr4i 257 | . 2 |
6 | 5 | ssriv 3277 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wceq 1642 wcel 1710 wss 3257 cpw 3722 csn 3737 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1546 ax-5 1557 ax-17 1616 ax-9 1654 ax-8 1675 ax-6 1729 ax-7 1734 ax-11 1746 ax-12 1925 ax-ext 2334 |
This theorem depends on definitions: df-bi 177 df-or 359 df-an 360 df-nan 1288 df-tru 1319 df-ex 1542 df-nf 1545 df-sb 1649 df-clab 2340 df-cleq 2346 df-clel 2349 df-nfc 2478 df-v 2861 df-nin 3211 df-compl 3212 df-in 3213 df-ss 3259 df-pw 3724 df-sn 3741 |
This theorem is referenced by: (None) |
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