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Mirrors > Home > ILE Home > Th. List > nfralw | GIF version |
Description: Bound-variable hypothesis builder for restricted quantification. See nfralya 2510 for a version with 𝑦 and 𝐴 distinct instead of 𝑥 and 𝑦. (Contributed by NM, 1-Sep-1999.) (Revised by Gino Giotto, 10-Jan-2024.) |
Ref | Expression |
---|---|
nfralw.1 | ⊢ Ⅎ𝑥𝐴 |
nfralw.2 | ⊢ Ⅎ𝑥𝜑 |
Ref | Expression |
---|---|
nfralw | ⊢ Ⅎ𝑥∀𝑦 ∈ 𝐴 𝜑 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nftru 1459 | . . 3 ⊢ Ⅎ𝑦⊤ | |
2 | nfralw.1 | . . . 4 ⊢ Ⅎ𝑥𝐴 | |
3 | 2 | a1i 9 | . . 3 ⊢ (⊤ → Ⅎ𝑥𝐴) |
4 | nfralw.2 | . . . 4 ⊢ Ⅎ𝑥𝜑 | |
5 | 4 | a1i 9 | . . 3 ⊢ (⊤ → Ⅎ𝑥𝜑) |
6 | 1, 3, 5 | nfraldw 2502 | . 2 ⊢ (⊤ → Ⅎ𝑥∀𝑦 ∈ 𝐴 𝜑) |
7 | 6 | mptru 1357 | 1 ⊢ Ⅎ𝑥∀𝑦 ∈ 𝐴 𝜑 |
Colors of variables: wff set class |
Syntax hints: ⊤wtru 1349 Ⅎwnf 1453 Ⅎwnfc 2299 ∀wral 2448 |
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 1440 ax-7 1441 ax-gen 1442 ax-ie1 1486 ax-ie2 1487 ax-4 1503 ax-17 1519 ax-ial 1527 ax-i5r 1528 ax-ext 2152 |
This theorem depends on definitions: df-bi 116 df-tru 1351 df-nf 1454 df-cleq 2163 df-clel 2166 df-nfc 2301 df-ral 2453 |
This theorem is referenced by: rspc2vd 3117 fprod2dlemstep 11585 fprodcom2fi 11589 nnwofdc 11993 |
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