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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 6372 | . . 3 ⊢ ∅ ∈ On | |
| 2 | oldval 27851 | . . 3 ⊢ (∅ ∈ On → ( O ‘∅) = ∪ ( M “ ∅)) | |
| 3 | 1, 2 | ax-mp 5 | . 2 ⊢ ( O ‘∅) = ∪ ( M “ ∅) |
| 4 | ima0 6036 | . . 3 ⊢ ( M “ ∅) = ∅ | |
| 5 | 4 | unieqi 4857 | . 2 ⊢ ∪ ( M “ ∅) = ∪ ∅ |
| 6 | uni0 4873 | . 2 ⊢ ∪ ∅ = ∅ | |
| 7 | 3, 5, 6 | 3eqtri 2767 | 1 ⊢ ( O ‘∅) = ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1547 ∈ wcel 2119 ∅c0 4268 ∪ cuni 4845 “ cima 5628 Oncon0 6317 ‘cfv 6492 M cmade 27839 O cold 27840 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2712 ax-rep 5206 ax-sep 5225 ax-nul 5235 ax-pr 5369 ax-un 7685 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3or 1093 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2719 df-cleq 2732 df-clel 2815 df-nfc 2889 df-ne 2936 df-ral 3055 df-rex 3065 df-reu 3346 df-rab 3393 df-v 3434 df-sbc 3731 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4269 df-if 4462 df-pw 4538 df-sn 4563 df-pr 4565 df-op 4569 df-uni 4846 df-iun 4930 df-br 5080 df-opab 5142 df-mpt 5161 df-tr 5187 df-id 5520 df-eprel 5525 df-po 5533 df-so 5534 df-fr 5578 df-we 5580 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-res 5637 df-ima 5638 df-pred 6259 df-ord 6320 df-on 6321 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-ov 7366 df-2nd 7939 df-frecs 8228 df-wrecs 8259 df-recs 8308 df-made 27844 df-old 27845 |
| This theorem is referenced by: leftval 27866 rightval 27867 new0 27881 left0s 27910 right0s 27911 lrold 27914 |
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