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Mirrors > Home > MPE Home > Th. List > Mathboxes > grusucd | Structured version Visualization version GIF version |
Description: Grothendieck universes are closed under ordinal successor. (Contributed by Rohan Ridenour, 9-Aug-2023.) |
Ref | Expression |
---|---|
grusucd.1 | ⊢ (𝜑 → 𝐺 ∈ Univ) |
grusucd.2 | ⊢ (𝜑 → 𝐴 ∈ 𝐺) |
Ref | Expression |
---|---|
grusucd | ⊢ (𝜑 → suc 𝐴 ∈ 𝐺) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-suc 6267 | . 2 ⊢ suc 𝐴 = (𝐴 ∪ {𝐴}) | |
2 | grusucd.1 | . . 3 ⊢ (𝜑 → 𝐺 ∈ Univ) | |
3 | grusucd.2 | . . 3 ⊢ (𝜑 → 𝐴 ∈ 𝐺) | |
4 | grusn 10549 | . . . 4 ⊢ ((𝐺 ∈ Univ ∧ 𝐴 ∈ 𝐺) → {𝐴} ∈ 𝐺) | |
5 | 2, 3, 4 | syl2anc 584 | . . 3 ⊢ (𝜑 → {𝐴} ∈ 𝐺) |
6 | gruun 10551 | . . 3 ⊢ ((𝐺 ∈ Univ ∧ 𝐴 ∈ 𝐺 ∧ {𝐴} ∈ 𝐺) → (𝐴 ∪ {𝐴}) ∈ 𝐺) | |
7 | 2, 3, 5, 6 | syl3anc 1370 | . 2 ⊢ (𝜑 → (𝐴 ∪ {𝐴}) ∈ 𝐺) |
8 | 1, 7 | eqeltrid 2843 | 1 ⊢ (𝜑 → suc 𝐴 ∈ 𝐺) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 2106 ∪ cun 3886 {csn 4563 suc csuc 6263 Univcgru 10535 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7580 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ral 3069 df-rex 3070 df-rab 3073 df-v 3433 df-sbc 3718 df-dif 3891 df-un 3893 df-in 3895 df-ss 3905 df-nul 4259 df-if 4462 df-pw 4537 df-sn 4564 df-pr 4566 df-op 4570 df-uni 4842 df-iun 4928 df-br 5076 df-opab 5138 df-mpt 5159 df-tr 5193 df-id 5486 df-xp 5592 df-rel 5593 df-cnv 5594 df-co 5595 df-dm 5596 df-rn 5597 df-res 5598 df-ima 5599 df-suc 6267 df-iota 6386 df-fun 6430 df-fn 6431 df-f 6432 df-fv 6436 df-ov 7272 df-oprab 7273 df-mpo 7274 df-map 8606 df-gru 10536 |
This theorem is referenced by: gruscottcld 41827 |
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