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| Mirrors > Home > MPE Home > Th. List > oe0m1 | Structured version Visualization version GIF version | ||
| Description: Ordinal exponentiation with zero base and nonzero exponent. Proposition 8.31(2) of [TakeutiZaring] p. 67 and its converse. Definition 2.6 of [Schloeder] p. 4. (Contributed by NM, 5-Jan-2005.) |
| Ref | Expression |
|---|---|
| oe0m1 | ⊢ (𝐴 ∈ On → (∅ ∈ 𝐴 ↔ (∅ ↑o 𝐴) = ∅)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eloni 6341 | . . 3 ⊢ (𝐴 ∈ On → Ord 𝐴) | |
| 2 | ordgt0ge1 8446 | . . 3 ⊢ (Ord 𝐴 → (∅ ∈ 𝐴 ↔ 1o ⊆ 𝐴)) | |
| 3 | 1, 2 | syl 17 | . 2 ⊢ (𝐴 ∈ On → (∅ ∈ 𝐴 ↔ 1o ⊆ 𝐴)) |
| 4 | ssdif0 4309 | . . 3 ⊢ (1o ⊆ 𝐴 ↔ (1o ∖ 𝐴) = ∅) | |
| 5 | oe0m 8471 | . . . 4 ⊢ (𝐴 ∈ On → (∅ ↑o 𝐴) = (1o ∖ 𝐴)) | |
| 6 | 5 | eqeq1d 2754 | . . 3 ⊢ (𝐴 ∈ On → ((∅ ↑o 𝐴) = ∅ ↔ (1o ∖ 𝐴) = ∅)) |
| 7 | 4, 6 | bitr4id 292 | . 2 ⊢ (𝐴 ∈ On → (1o ⊆ 𝐴 ↔ (∅ ↑o 𝐴) = ∅)) |
| 8 | 3, 7 | bitrd 281 | 1 ⊢ (𝐴 ∈ On → (∅ ∈ 𝐴 ↔ (∅ ↑o 𝐴) = ∅)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 208 = wceq 1550 ∈ wcel 2132 ∖ cdif 3892 ⊆ wss 3895 ∅c0 4276 Ord word 6330 Oncon0 6331 (class class class)co 7381 1oc1o 8414 ↑o coe 8420 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1805 ax-4 1819 ax-5 1920 ax-6 1977 ax-7 2018 ax-8 2134 ax-9 2142 ax-10 2165 ax-11 2181 ax-12 2202 ax-ext 2724 ax-sep 5236 ax-nul 5246 ax-pr 5380 |
| This theorem depends on definitions: df-bi 209 df-an 399 df-or 857 df-3or 1096 df-3an 1097 df-tru 1553 df-fal 1563 df-ex 1790 df-nf 1794 df-sb 2081 df-mo 2556 df-eu 2586 df-clab 2731 df-cleq 2744 df-clel 2827 df-nfc 2901 df-ne 2948 df-ral 3067 df-rex 3077 df-rab 3405 df-v 3446 df-sbc 3736 df-dif 3898 df-un 3900 df-in 3902 df-ss 3912 df-pss 3915 df-nul 4277 df-if 4471 df-pw 4547 df-sn 4573 df-pr 4575 df-op 4579 df-uni 4856 df-br 5091 df-opab 5153 df-mpt 5172 df-tr 5198 df-id 5531 df-eprel 5536 df-po 5544 df-so 5545 df-fr 5589 df-we 5591 df-xp 5642 df-rel 5643 df-cnv 5644 df-co 5645 df-dm 5646 df-rn 5647 df-res 5648 df-ima 5649 df-pred 6273 df-ord 6334 df-on 6335 df-suc 6337 df-iota 6462 df-fun 6508 df-fv 6514 df-ov 7384 df-oprab 7385 df-mpo 7386 df-frecs 8246 df-wrecs 8277 df-recs 8326 df-rdg 8365 df-1o 8421 df-oexp 8427 |
| This theorem is referenced by: oev2 8476 oesuclem 8478 oecl 8490 oewordri 8546 oelim2 8549 oeoa 8551 oeoe 8553 cantnf 9634 oe0suclim 43792 |
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