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Mirrors > Home > MPE Home > Th. List > nfmod | Structured version Visualization version GIF version |
Description: Bound-variable hypothesis builder for the at-most-one quantifier. Deduction version of nfmo 2642. Usage of this theorem is discouraged because it depends on ax-13 2386. Use the weaker nfmodv 2639 when possible. (Contributed by Mario Carneiro, 14-Nov-2016.) (New usage is discouraged.) |
Ref | Expression |
---|---|
nfmod.1 | ⊢ Ⅎ𝑦𝜑 |
nfmod.2 | ⊢ (𝜑 → Ⅎ𝑥𝜓) |
Ref | Expression |
---|---|
nfmod | ⊢ (𝜑 → Ⅎ𝑥∃*𝑦𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfmod.1 | . 2 ⊢ Ⅎ𝑦𝜑 | |
2 | nfmod.2 | . . 3 ⊢ (𝜑 → Ⅎ𝑥𝜓) | |
3 | 2 | adantr 483 | . 2 ⊢ ((𝜑 ∧ ¬ ∀𝑥 𝑥 = 𝑦) → Ⅎ𝑥𝜓) |
4 | 1, 3 | nfmod2 2638 | 1 ⊢ (𝜑 → Ⅎ𝑥∃*𝑦𝜓) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∀wal 1531 Ⅎwnf 1780 ∃*wmo 2616 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-10 2141 ax-11 2156 ax-12 2172 ax-13 2386 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1536 df-ex 1777 df-nf 1781 df-mo 2618 |
This theorem is referenced by: nfmo 2642 wl-mo3t 34806 |
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