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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 6396 | . . 3 ⊢ (𝐴 ∈ On → Ord 𝐴) | |
2 | ordgt0ge1 8530 | . . 3 ⊢ (Ord 𝐴 → (∅ ∈ 𝐴 ↔ 1o ⊆ 𝐴)) | |
3 | 1, 2 | syl 17 | . 2 ⊢ (𝐴 ∈ On → (∅ ∈ 𝐴 ↔ 1o ⊆ 𝐴)) |
4 | ssdif0 4372 | . . 3 ⊢ (1o ⊆ 𝐴 ↔ (1o ∖ 𝐴) = ∅) | |
5 | oe0m 8555 | . . . 4 ⊢ (𝐴 ∈ On → (∅ ↑o 𝐴) = (1o ∖ 𝐴)) | |
6 | 5 | eqeq1d 2737 | . . 3 ⊢ (𝐴 ∈ On → ((∅ ↑o 𝐴) = ∅ ↔ (1o ∖ 𝐴) = ∅)) |
7 | 4, 6 | bitr4id 290 | . 2 ⊢ (𝐴 ∈ On → (1o ⊆ 𝐴 ↔ (∅ ↑o 𝐴) = ∅)) |
8 | 3, 7 | bitrd 279 | 1 ⊢ (𝐴 ∈ On → (∅ ∈ 𝐴 ↔ (∅ ↑o 𝐴) = ∅)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 206 = wceq 1537 ∈ wcel 2106 ∖ cdif 3960 ⊆ wss 3963 ∅c0 4339 Ord word 6385 Oncon0 6386 (class class class)co 7431 1oc1o 8498 ↑o coe 8504 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-sep 5302 ax-nul 5312 ax-pr 5438 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-ral 3060 df-rex 3069 df-rab 3434 df-v 3480 df-sbc 3792 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-pss 3983 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-op 4638 df-uni 4913 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5583 df-eprel 5589 df-po 5597 df-so 5598 df-fr 5641 df-we 5643 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-pred 6323 df-ord 6389 df-on 6390 df-suc 6392 df-iota 6516 df-fun 6565 df-fv 6571 df-ov 7434 df-oprab 7435 df-mpo 7436 df-frecs 8305 df-wrecs 8336 df-recs 8410 df-rdg 8449 df-1o 8505 df-oexp 8511 |
This theorem is referenced by: oev2 8560 oesuclem 8562 oecl 8574 oewordri 8629 oelim2 8632 oeoa 8634 oeoe 8636 cantnf 9731 oe0suclim 43267 |
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