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Mirrors > Home > MPE Home > Th. List > rexsupp | Structured version Visualization version GIF version |
Description: Existential quantification restricted to a support. (Contributed by Stefan O'Rear, 23-Mar-2015.) (Revised by AV, 27-May-2019.) |
Ref | Expression |
---|---|
rexsupp | ⊢ ((𝐹 Fn 𝑋 ∧ 𝑋 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → (∃𝑥 ∈ (𝐹 supp 𝑍)𝜑 ↔ ∃𝑥 ∈ 𝑋 ((𝐹‘𝑥) ≠ 𝑍 ∧ 𝜑))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elsuppfn 7838 | . . . 4 ⊢ ((𝐹 Fn 𝑋 ∧ 𝑋 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → (𝑥 ∈ (𝐹 supp 𝑍) ↔ (𝑥 ∈ 𝑋 ∧ (𝐹‘𝑥) ≠ 𝑍))) | |
2 | 1 | anbi1d 631 | . . 3 ⊢ ((𝐹 Fn 𝑋 ∧ 𝑋 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → ((𝑥 ∈ (𝐹 supp 𝑍) ∧ 𝜑) ↔ ((𝑥 ∈ 𝑋 ∧ (𝐹‘𝑥) ≠ 𝑍) ∧ 𝜑))) |
3 | anass 471 | . . 3 ⊢ (((𝑥 ∈ 𝑋 ∧ (𝐹‘𝑥) ≠ 𝑍) ∧ 𝜑) ↔ (𝑥 ∈ 𝑋 ∧ ((𝐹‘𝑥) ≠ 𝑍 ∧ 𝜑))) | |
4 | 2, 3 | syl6bb 289 | . 2 ⊢ ((𝐹 Fn 𝑋 ∧ 𝑋 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → ((𝑥 ∈ (𝐹 supp 𝑍) ∧ 𝜑) ↔ (𝑥 ∈ 𝑋 ∧ ((𝐹‘𝑥) ≠ 𝑍 ∧ 𝜑)))) |
5 | 4 | rexbidv2 3295 | 1 ⊢ ((𝐹 Fn 𝑋 ∧ 𝑋 ∈ 𝑉 ∧ 𝑍 ∈ 𝑊) → (∃𝑥 ∈ (𝐹 supp 𝑍)𝜑 ↔ ∃𝑥 ∈ 𝑋 ((𝐹‘𝑥) ≠ 𝑍 ∧ 𝜑))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 ∧ w3a 1083 ∈ wcel 2114 ≠ wne 3016 ∃wrex 3139 Fn wfn 6350 ‘cfv 6355 (class class class)co 7156 supp csupp 7830 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-rep 5190 ax-sep 5203 ax-nul 5210 ax-pr 5330 ax-un 7461 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3496 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-nul 4292 df-if 4468 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4839 df-iun 4921 df-br 5067 df-opab 5129 df-mpt 5147 df-id 5460 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-ov 7159 df-oprab 7160 df-mpo 7161 df-supp 7831 |
This theorem is referenced by: mdegldg 24660 |
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