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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 1986). 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 3056 | . . . 4 ⊢ (∀𝑥 ∈ 𝐴 𝜑 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝜑)) | |
2 | exintr 1900 | . . . 4 ⊢ (∀𝑥(𝑥 ∈ 𝐴 → 𝜑) → (∃𝑥 𝑥 ∈ 𝐴 → ∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑))) | |
3 | 1, 2 | sylbi 220 | . . 3 ⊢ (∀𝑥 ∈ 𝐴 𝜑 → (∃𝑥 𝑥 ∈ 𝐴 → ∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑))) |
4 | n0 4247 | . . 3 ⊢ (𝐴 ≠ ∅ ↔ ∃𝑥 𝑥 ∈ 𝐴) | |
5 | df-rex 3057 | . . 3 ⊢ (∃𝑥 ∈ 𝐴 𝜑 ↔ ∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑)) | |
6 | 3, 4, 5 | 3imtr4g 299 | . 2 ⊢ (∀𝑥 ∈ 𝐴 𝜑 → (𝐴 ≠ ∅ → ∃𝑥 ∈ 𝐴 𝜑)) |
7 | 6 | impcom 411 | 1 ⊢ ((𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 𝜑) → ∃𝑥 ∈ 𝐴 𝜑) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 399 ∀wal 1541 ∃wex 1787 ∈ wcel 2112 ≠ wne 2932 ∀wral 3051 ∃wrex 3052 ∅c0 4223 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2018 ax-9 2122 ax-ext 2708 |
This theorem depends on definitions: df-bi 210 df-an 400 df-tru 1546 df-fal 1556 df-ex 1788 df-sb 2073 df-clab 2715 df-cleq 2728 df-ne 2933 df-ral 3056 df-rex 3057 df-dif 3856 df-nul 4224 |
This theorem is referenced by: r19.2zb 4393 intssuni 4867 iinssiun 4903 riinn0 4977 iinexg 5219 reusv2lem2 5277 reusv2lem3 5278 xpiindi 5689 cnviin 6129 eusvobj2 7184 iiner 8449 finsschain 8961 cfeq0 9835 cfsuc 9836 iundom2g 10119 alephval2 10151 prlem934 10612 supaddc 11764 supadd 11765 supmul1 11766 supmullem2 11768 supmul 11769 rexfiuz 14876 r19.2uz 14880 climuni 15078 caurcvg 15205 caurcvg2 15206 caucvg 15207 pc2dvds 16395 vdwmc2 16495 vdwlem6 16502 vdwnnlem3 16513 issubg4 18516 gexcl3 18930 lbsextlem2 20150 iincld 21890 opnnei 21971 cncnp2 22132 lmmo 22231 iunconn 22279 ptbasfi 22432 filuni 22736 isfcls 22860 fclsopn 22865 ustfilxp 23064 nrginvrcn 23544 lebnumlem3 23814 cfil3i 24120 caun0 24132 iscmet3 24144 nulmbl2 24387 dyadmax 24449 itg2seq 24594 itg2monolem1 24602 bddiblnc 24693 rolle 24841 c1lip1 24848 taylfval 25205 ulm0 25237 frgrreg 28431 bnj906 32577 cvmliftlem15 32927 dfon2lem6 33434 filnetlem4 34256 itg2addnclem 35514 itg2addnc 35517 itg2gt0cn 35518 ftc1anc 35544 filbcmb 35584 incsequz 35592 isbnd2 35627 isbnd3 35628 ssbnd 35632 unichnidl 35875 iunconnlem2 42169 upbdrech 42458 infxrpnf 42601 |
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