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Mirrors > Home > MPE Home > Th. List > r19.2z | Structured version Visualization version GIF version |
Description: Theorem 19.2 of [Margaris] p. 89 with restricted quantifiers (compare 19.2 1879). The restricted version is valid only when the domain of quantification is not empty. (Contributed by NM, 15-Nov-2003.) |
Ref | Expression |
---|---|
r19.2z | ⊢ ((𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 𝜑) → ∃𝑥 ∈ 𝐴 𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-ral 2901 | . . . 4 ⊢ (∀𝑥 ∈ 𝐴 𝜑 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝜑)) | |
2 | exintr 1810 | . . . 4 ⊢ (∀𝑥(𝑥 ∈ 𝐴 → 𝜑) → (∃𝑥 𝑥 ∈ 𝐴 → ∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑))) | |
3 | 1, 2 | sylbi 206 | . . 3 ⊢ (∀𝑥 ∈ 𝐴 𝜑 → (∃𝑥 𝑥 ∈ 𝐴 → ∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑))) |
4 | n0 3890 | . . 3 ⊢ (𝐴 ≠ ∅ ↔ ∃𝑥 𝑥 ∈ 𝐴) | |
5 | df-rex 2902 | . . 3 ⊢ (∃𝑥 ∈ 𝐴 𝜑 ↔ ∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑)) | |
6 | 3, 4, 5 | 3imtr4g 284 | . 2 ⊢ (∀𝑥 ∈ 𝐴 𝜑 → (𝐴 ≠ ∅ → ∃𝑥 ∈ 𝐴 𝜑)) |
7 | 6 | impcom 445 | 1 ⊢ ((𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 𝜑) → ∃𝑥 ∈ 𝐴 𝜑) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 383 ∀wal 1473 ∃wex 1695 ∈ wcel 1977 ≠ wne 2780 ∀wral 2896 ∃wrex 2897 ∅c0 3874 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-ral 2901 df-rex 2902 df-v 3175 df-dif 3543 df-nul 3875 |
This theorem is referenced by: r19.2zb 4013 intssuni 4434 riinn0 4531 trintss 4697 iinexg 4751 reusv2lem2 4795 reusv2lem2OLD 4796 reusv2lem3 4797 xpiindi 5179 cnviin 5589 eusvobj2 6542 iiner 7706 finsschain 8156 cfeq0 8961 cfsuc 8962 iundom2g 9241 alephval2 9273 prlem934 9734 supaddc 10867 supadd 10868 supmul1 10869 supmullem2 10871 supmul 10872 rexfiuz 13935 r19.2uz 13939 climuni 14131 caurcvg 14255 caurcvg2 14256 caucvg 14257 pc2dvds 15421 vdwmc2 15521 vdwlem6 15528 vdwnnlem3 15539 issubg4 17436 gexcl3 17825 lbsextlem2 18980 iincld 20653 opnnei 20734 cncnp2 20895 lmmo 20994 iuncon 21041 ptbasfi 21194 filuni 21499 isfcls 21623 fclsopn 21628 ustfilxp 21826 nrginvrcn 22306 lebnumlem3 22570 cfil3i 22875 caun0 22887 iscmet3 22899 nulmbl2 23111 dyadmax 23172 itg2seq 23315 itg2monolem1 23323 rolle 23557 c1lip1 23564 taylfval 23917 ulm0 23949 usgreghash2spot 26596 bnj906 30254 cvmliftlem15 30534 dfon2lem6 30937 filnetlem4 31546 itg2addnclem 32631 itg2addnc 32634 itg2gt0cn 32635 bddiblnc 32650 ftc1anc 32663 filbcmb 32705 incsequz 32714 isbnd2 32752 isbnd3 32753 ssbnd 32757 unichnidl 33000 iunconlem2 38193 upbdrech 38460 fusgreghash2wsp 41502 av-frgrareg 41548 |
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