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| Mirrors > Home > MPE Home > Th. List > oe0m0 | Structured version Visualization version GIF version | ||
| Description: Ordinal exponentiation with zero base and zero exponent. Proposition 8.31 of [TakeutiZaring] p. 67. (Contributed by NM, 31-Dec-2004.) |
| Ref | Expression |
|---|---|
| oe0m0 | ⊢ (∅ ↑o ∅) = 1o |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0elon 6416 | . . 3 ⊢ ∅ ∈ On | |
| 2 | oe0m 8499 | . . 3 ⊢ (∅ ∈ On → (∅ ↑o ∅) = (1o ∖ ∅)) | |
| 3 | 1, 2 | ax-mp 5 | . 2 ⊢ (∅ ↑o ∅) = (1o ∖ ∅) |
| 4 | dif0 4334 | . 2 ⊢ (1o ∖ ∅) = 1o | |
| 5 | 3, 4 | eqtri 2786 | 1 ⊢ (∅ ↑o ∅) = 1o |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1570 ∈ wcel 2143 ∖ cdif 3902 ∅c0 4286 Oncon0 6360 (class class class)co 7410 1oc1o 8442 ↑o coe 8448 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-sep 5257 ax-nul 5269 ax-pr 5404 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-ral 3080 df-rex 3090 df-rab 3417 df-v 3457 df-sbc 3745 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-nul 4287 df-if 4488 df-pw 4564 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4873 df-br 5110 df-opab 5174 df-mpt 5193 df-tr 5219 df-id 5556 df-po 5569 df-so 5570 df-fr 5614 df-we 5616 df-xp 5667 df-rel 5668 df-cnv 5669 df-co 5670 df-dm 5671 df-rn 5672 df-res 5673 df-ima 5674 df-pred 6302 df-ord 6363 df-on 6364 df-suc 6366 df-iota 6492 df-fun 6538 df-fv 6544 df-ov 7413 df-oprab 7414 df-mpo 7415 df-frecs 8274 df-wrecs 8305 df-recs 8354 df-rdg 8393 df-1o 8449 df-oexp 8455 |
| This theorem is referenced by: oe0 8503 oev2 8504 oesuclem 8506 oecl 8518 oeoa 8579 oeoe 8581 |
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