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| Mirrors > Home > MPE Home > Th. List > Mathboxes > gru0eld | Structured version Visualization version GIF version | ||
| Description: A nonempty Grothendieck universe contains the empty set. (Contributed by Rohan Ridenour, 11-Aug-2023.) |
| Ref | Expression |
|---|---|
| gru0eld.1 | ⊢ (𝜑 → 𝐺 ∈ Univ) |
| gru0eld.2 | ⊢ (𝜑 → 𝐴 ∈ 𝐺) |
| Ref | Expression |
|---|---|
| gru0eld | ⊢ (𝜑 → ∅ ∈ 𝐺) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | gru0eld.1 | . 2 ⊢ (𝜑 → 𝐺 ∈ Univ) | |
| 2 | gru0eld.2 | . 2 ⊢ (𝜑 → 𝐴 ∈ 𝐺) | |
| 3 | 0ss 4356 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
| 4 | 3 | a1i 11 | . 2 ⊢ (𝜑 → ∅ ⊆ 𝐴) |
| 5 | gruss 10787 | . 2 ⊢ ((𝐺 ∈ Univ ∧ 𝐴 ∈ 𝐺 ∧ ∅ ⊆ 𝐴) → ∅ ∈ 𝐺) | |
| 6 | 1, 2, 4, 5 | syl3anc 1397 | 1 ⊢ (𝜑 → ∅ ∈ 𝐺) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2142 ⊆ wss 3904 ∅c0 4285 Univcgru 10781 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1824 ax-4 1838 ax-5 1939 ax-6 1996 ax-7 2037 ax-8 2144 ax-9 2152 ax-ext 2734 ax-sep 5256 |
| This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1104 df-tru 1572 df-fal 1582 df-ex 1809 df-sb 2096 df-clab 2741 df-cleq 2754 df-clel 2837 df-ral 3079 df-rex 3089 df-rab 3416 df-v 3456 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-nul 4286 df-if 4487 df-pw 4563 df-sn 4589 df-pr 4591 df-op 4595 df-uni 4872 df-br 5109 df-tr 5218 df-iota 6492 df-fv 6544 df-ov 7415 df-gru 10782 |
| This theorem is used by: grur1cld 44984 grucollcld 44998 |
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