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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 6257 | . 2 ⊢ suc 𝐴 = (𝐴 ∪ {𝐴}) | |
2 | grusucd.1 | . . 3 ⊢ (𝜑 → 𝐺 ∈ Univ) | |
3 | grusucd.2 | . . 3 ⊢ (𝜑 → 𝐴 ∈ 𝐺) | |
4 | grusn 10491 | . . . 4 ⊢ ((𝐺 ∈ Univ ∧ 𝐴 ∈ 𝐺) → {𝐴} ∈ 𝐺) | |
5 | 2, 3, 4 | syl2anc 583 | . . 3 ⊢ (𝜑 → {𝐴} ∈ 𝐺) |
6 | gruun 10493 | . . 3 ⊢ ((𝐺 ∈ Univ ∧ 𝐴 ∈ 𝐺 ∧ {𝐴} ∈ 𝐺) → (𝐴 ∪ {𝐴}) ∈ 𝐺) | |
7 | 2, 3, 5, 6 | syl3anc 1369 | . 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 2108 ∪ cun 3881 {csn 4558 suc csuc 6253 Univcgru 10477 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ral 3068 df-rex 3069 df-rab 3072 df-v 3424 df-sbc 3712 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-op 4565 df-uni 4837 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-fv 6426 df-ov 7258 df-oprab 7259 df-mpo 7260 df-map 8575 df-gru 10478 |
This theorem is referenced by: gruscottcld 41756 |
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