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Mirrors > Home > MPE Home > Th. List > hban | Structured version Visualization version GIF version |
Description: If 𝑥 is not free in 𝜑 and 𝜓, it is not free in (𝜑 ∧ 𝜓). (Contributed by NM, 14-May-1993.) (Proof shortened by Wolf Lammen, 2-Jan-2018.) |
Ref | Expression |
---|---|
hb.1 | ⊢ (𝜑 → ∀𝑥𝜑) |
hb.2 | ⊢ (𝜓 → ∀𝑥𝜓) |
Ref | Expression |
---|---|
hban | ⊢ ((𝜑 ∧ 𝜓) → ∀𝑥(𝜑 ∧ 𝜓)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | hb.1 | . . . 4 ⊢ (𝜑 → ∀𝑥𝜑) | |
2 | 1 | nf5i 2011 | . . 3 ⊢ Ⅎ𝑥𝜑 |
3 | hb.2 | . . . 4 ⊢ (𝜓 → ∀𝑥𝜓) | |
4 | 3 | nf5i 2011 | . . 3 ⊢ Ⅎ𝑥𝜓 |
5 | 2, 4 | nfan 1816 | . 2 ⊢ Ⅎ𝑥(𝜑 ∧ 𝜓) |
6 | 5 | nf5ri 2053 | 1 ⊢ ((𝜑 ∧ 𝜓) → ∀𝑥(𝜑 ∧ 𝜓)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 383 ∀wal 1473 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-10 2006 ax-12 2034 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-tru 1478 df-ex 1696 df-nf 1701 |
This theorem is referenced by: bnj982 30103 bnj1351 30151 bnj1352 30152 bnj1441 30165 dvelimf-o 33232 ax12indalem 33248 ax12inda2ALT 33249 hbimpg 37791 hbimpgVD 38162 |
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