| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > MPE Home > Th. List > prcssprc | Structured version Visualization version GIF version | ||
| Description: The superclass of a proper class is a proper class. (Contributed by AV, 27-Dec-2020.) |
| Ref | Expression |
|---|---|
| prcssprc | ⊢ ((𝐴 ⊆ 𝐵 ∧ 𝐴 ∉ V) → 𝐵 ∉ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ssexg 5295 | . . . 4 ⊢ ((𝐴 ⊆ 𝐵 ∧ 𝐵 ∈ V) → 𝐴 ∈ V) | |
| 2 | 1 | ex 418 | . . 3 ⊢ (𝐴 ⊆ 𝐵 → (𝐵 ∈ V → 𝐴 ∈ V)) |
| 3 | 2 | nelcon3d 3071 | . 2 ⊢ (𝐴 ⊆ 𝐵 → (𝐴 ∉ V → 𝐵 ∉ V)) |
| 4 | 3 | imp 412 | 1 ⊢ ((𝐴 ⊆ 𝐵 ∧ 𝐴 ∉ V) → 𝐵 ∉ V) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∈ wcel 2146 ∉ wnel 3067 Vcvv 3458 ⊆ wss 3908 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-ext 2738 ax-sep 5262 |
| This proof depends on definitions: df-bi 210 df-an 402 df-3an 1105 df-tru 1573 df-ex 1813 df-sb 2100 df-clab 2745 df-cleq 2758 df-clel 2841 df-nel 3068 df-rab 3420 df-v 3460 df-in 3915 df-ss 3925 |
| This theorem is used by: usgrprc 29653 rgrusgrprc 29976 rgrprc 29978 fsetprcnexALT 47840 |
| Copyright terms: Public domain | W3C validator |