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Mirrors > Home > MPE Home > Th. List > 19.27OLD | Structured version Visualization version GIF version |
Description: Obsolete proof of 19.27 2095 as of 6-Oct-2021. (Contributed by NM, 21-Jun-1993.) (Proof modification is discouraged.) (New usage is discouraged.) |
Ref | Expression |
---|---|
19.27OLD.1 | ⊢ Ⅎ𝑥𝜓 |
Ref | Expression |
---|---|
19.27OLD | ⊢ (∀𝑥(𝜑 ∧ 𝜓) ↔ (∀𝑥𝜑 ∧ 𝜓)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 19.26 1798 | . 2 ⊢ (∀𝑥(𝜑 ∧ 𝜓) ↔ (∀𝑥𝜑 ∧ ∀𝑥𝜓)) | |
2 | 19.27OLD.1 | . . . 4 ⊢ Ⅎ𝑥𝜓 | |
3 | 2 | 19.3OLD 2202 | . . 3 ⊢ (∀𝑥𝜓 ↔ 𝜓) |
4 | 3 | anbi2i 730 | . 2 ⊢ ((∀𝑥𝜑 ∧ ∀𝑥𝜓) ↔ (∀𝑥𝜑 ∧ 𝜓)) |
5 | 1, 4 | bitri 264 | 1 ⊢ (∀𝑥(𝜑 ∧ 𝜓) ↔ (∀𝑥𝜑 ∧ 𝜓)) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 196 ∧ wa 384 ∀wal 1481 ℲwnfOLD 1709 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-12 2047 |
This theorem depends on definitions: df-bi 197 df-an 386 df-ex 1705 df-nfOLD 1721 |
This theorem is referenced by: (None) |
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