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Mirrors > Home > MPE Home > Th. List > Mathboxes > pm14.18 | Structured version Visualization version GIF version |
Description: Theorem *14.18 in [WhiteheadRussell] p. 189. (Contributed by Andrew Salmon, 11-Jul-2011.) |
Ref | Expression |
---|---|
pm14.18 | ⊢ (∃!𝑥𝜑 → (∀𝑥𝜓 → [(℩𝑥𝜑) / 𝑥]𝜓)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | iotaexeu 40743 | . 2 ⊢ (∃!𝑥𝜑 → (℩𝑥𝜑) ∈ V) | |
2 | spsbc 3784 | . 2 ⊢ ((℩𝑥𝜑) ∈ V → (∀𝑥𝜓 → [(℩𝑥𝜑) / 𝑥]𝜓)) | |
3 | 1, 2 | syl 17 | 1 ⊢ (∃!𝑥𝜑 → (∀𝑥𝜓 → [(℩𝑥𝜑) / 𝑥]𝜓)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∀wal 1531 ∈ wcel 2110 ∃!weu 2649 Vcvv 3494 [wsbc 3771 ℩cio 6306 |
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-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-rex 3144 df-v 3496 df-sbc 3772 df-un 3940 df-sn 4561 df-pr 4563 df-uni 4832 df-iota 6308 |
This theorem is referenced by: (None) |
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