Mathbox for Wolf Lammen |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > wl-motae | Structured version Visualization version GIF version |
Description: Change bound variable. Uses only Tarski's FOL axiom schemes. Part of Lemma 7 of [KalishMontague] p. 86. (Contributed by Wolf Lammen, 5-Mar-2023.) |
Ref | Expression |
---|---|
wl-motae | ⊢ (∃*𝑢⊤ → ∀𝑥 𝑦 = 𝑧) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | wl-cbvmotv 34747 | . 2 ⊢ (∃*𝑢⊤ → ∃*𝑣⊤) | |
2 | wl-moteq 34748 | . . 3 ⊢ (∃*𝑣⊤ → 𝑦 = 𝑧) | |
3 | 2 | alrimiv 1924 | . 2 ⊢ (∃*𝑣⊤ → ∀𝑥 𝑦 = 𝑧) |
4 | 1, 3 | syl 17 | 1 ⊢ (∃*𝑢⊤ → ∀𝑥 𝑦 = 𝑧) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∀wal 1531 ⊤wtru 1534 ∃*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 |
This theorem depends on definitions: df-bi 209 df-an 399 df-tru 1536 df-ex 1777 df-mo 2618 |
This theorem is referenced by: wl-moae 34750 |
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