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Mirrors > Home > ILE Home > Th. List > ral0 | GIF version |
Description: Vacuous universal quantification is always true. (Contributed by NM, 20-Oct-2005.) |
Ref | Expression |
---|---|
ral0 | ⊢ ∀𝑥 ∈ ∅ 𝜑 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | noel 3367 | . . 3 ⊢ ¬ 𝑥 ∈ ∅ | |
2 | 1 | pm2.21i 635 | . 2 ⊢ (𝑥 ∈ ∅ → 𝜑) |
3 | 2 | rgen 2485 | 1 ⊢ ∀𝑥 ∈ ∅ 𝜑 |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 1480 ∀wral 2416 ∅c0 3363 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ral 2421 df-v 2688 df-dif 3073 df-nul 3364 |
This theorem is referenced by: 0iin 3871 po0 4233 so0 4248 we0 4283 ord0 4313 omsinds 4535 mpt0 5250 iso0 5718 ixp0x 6620 ac6sfi 6792 fimax2gtri 6795 finomni 7012 uzsinds 10215 seq3f1olemp 10275 rexfiuz 10761 fimaxre2 10998 2prm 11808 bj-nntrans 13149 |
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