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Mirrors > Home > ILE Home > Th. List > elvd | GIF version |
Description: Technical lemma used to shorten proofs. If a proposition is implied by 𝑥 ∈ V (which is true, see vex 2715) and another antecedent, then it is implied by the other antecedent. (Contributed by Peter Mazsa, 23-Oct-2018.) |
Ref | Expression |
---|---|
elvd.1 | ⊢ ((𝜑 ∧ 𝑥 ∈ V) → 𝜓) |
Ref | Expression |
---|---|
elvd | ⊢ (𝜑 → 𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | vex 2715 | . 2 ⊢ 𝑥 ∈ V | |
2 | elvd.1 | . 2 ⊢ ((𝜑 ∧ 𝑥 ∈ V) → 𝜓) | |
3 | 1, 2 | mpan2 422 | 1 ⊢ (𝜑 → 𝜓) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ∈ wcel 2128 Vcvv 2712 |
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-5 1427 ax-gen 1429 ax-ie1 1473 ax-ie2 1474 ax-8 1484 ax-4 1490 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-ext 2139 |
This theorem depends on definitions: df-bi 116 df-sb 1743 df-clab 2144 df-cleq 2150 df-clel 2153 df-v 2714 |
This theorem is referenced by: omp1eomlem 7038 imasnopn 12699 pw1nct 13575 |
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