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| Mirrors > Home > MPE Home > Th. List > old0 | Structured version Visualization version GIF version | ||
| Description: No surreal is older than ∅. (Contributed by Scott Fenton, 7-Aug-2024.) |
| Ref | Expression |
|---|---|
| old0 | ⊢ ( O ‘∅) = ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0elon 6390 | . . 3 ⊢ ∅ ∈ On | |
| 2 | oldval 27897 | . . 3 ⊢ (∅ ∈ On → ( O ‘∅) = ∪ ( M “ ∅)) | |
| 3 | 1, 2 | ax-mp 5 | . 2 ⊢ ( O ‘∅) = ∪ ( M “ ∅) |
| 4 | ima0 6056 | . . 3 ⊢ ( M “ ∅) = ∅ | |
| 5 | 4 | unieqi 4871 | . 2 ⊢ ∪ ( M “ ∅) = ∪ ∅ |
| 6 | uni0 4888 | . 2 ⊢ ∪ ∅ = ∅ | |
| 7 | 3, 5, 6 | 3eqtri 2783 | 1 ⊢ ( O ‘∅) = ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1554 ∈ wcel 2136 ∅c0 4280 ∪ cuni 4859 “ cima 5643 Oncon0 6335 ‘cfv 6510 M cmade 27885 O cold 27886 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1809 ax-4 1823 ax-5 1924 ax-6 1981 ax-7 2022 ax-8 2138 ax-9 2146 ax-10 2169 ax-11 2185 ax-12 2206 ax-ext 2728 ax-rep 5221 ax-sep 5240 ax-nul 5250 ax-pr 5384 ax-un 7707 |
| This theorem depends on definitions: df-bi 209 df-an 399 df-or 857 df-3or 1096 df-3an 1097 df-tru 1557 df-fal 1567 df-ex 1794 df-nf 1798 df-sb 2085 df-mo 2560 df-eu 2590 df-clab 2735 df-cleq 2748 df-clel 2831 df-nfc 2905 df-ne 2952 df-ral 3071 df-rex 3081 df-reu 3362 df-rab 3409 df-v 3450 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4281 df-if 4475 df-pw 4551 df-sn 4577 df-pr 4579 df-op 4583 df-uni 4860 df-iun 4945 df-br 5095 df-opab 5157 df-mpt 5176 df-tr 5202 df-id 5535 df-eprel 5540 df-po 5548 df-so 5549 df-fr 5593 df-we 5595 df-xp 5646 df-rel 5647 df-cnv 5648 df-co 5649 df-dm 5650 df-rn 5651 df-res 5652 df-ima 5653 df-pred 6277 df-ord 6338 df-on 6339 df-suc 6341 df-iota 6466 df-fun 6512 df-fn 6513 df-f 6514 df-f1 6515 df-fo 6516 df-f1o 6517 df-fv 6518 df-ov 7388 df-2nd 7960 df-frecs 8250 df-wrecs 8281 df-recs 8330 df-made 27890 df-old 27891 |
| This theorem is referenced by: leftval 27912 rightval 27913 new0 27927 left0s 27956 right0s 27957 lrold 27960 |
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