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| Mirrors > Home > ILE Home > Th. List > cnpf2 | GIF version | ||
| Description: A continuous function at point 𝑃 is a mapping. (Contributed by Mario Carneiro, 21-Aug-2015.) (Revised by Jim Kingdon, 28-Mar-2023.) |
| Ref | Expression |
|---|---|
| cnpf2 | ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐾 ∈ (TopOn‘𝑌) ∧ 𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃)) → 𝐹:𝑋⟶𝑌) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simp3 1002 | . . 3 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐾 ∈ (TopOn‘𝑌) ∧ 𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃)) → 𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃)) | |
| 2 | topontop 14556 | . . . . 5 ⊢ (𝐾 ∈ (TopOn‘𝑌) → 𝐾 ∈ Top) | |
| 3 | cnprcl2k 14748 | . . . . 5 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐾 ∈ Top ∧ 𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃)) → 𝑃 ∈ 𝑋) | |
| 4 | 2, 3 | syl3an2 1284 | . . . 4 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐾 ∈ (TopOn‘𝑌) ∧ 𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃)) → 𝑃 ∈ 𝑋) |
| 5 | iscnp 14741 | . . . 4 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐾 ∈ (TopOn‘𝑌) ∧ 𝑃 ∈ 𝑋) → (𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ↔ (𝐹:𝑋⟶𝑌 ∧ ∀𝑎 ∈ 𝐾 ((𝐹‘𝑃) ∈ 𝑎 → ∃𝑏 ∈ 𝐽 (𝑃 ∈ 𝑏 ∧ (𝐹 “ 𝑏) ⊆ 𝑎))))) | |
| 6 | 4, 5 | syld3an3 1295 | . . 3 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐾 ∈ (TopOn‘𝑌) ∧ 𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃)) → (𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃) ↔ (𝐹:𝑋⟶𝑌 ∧ ∀𝑎 ∈ 𝐾 ((𝐹‘𝑃) ∈ 𝑎 → ∃𝑏 ∈ 𝐽 (𝑃 ∈ 𝑏 ∧ (𝐹 “ 𝑏) ⊆ 𝑎))))) |
| 7 | 1, 6 | mpbid 147 | . 2 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐾 ∈ (TopOn‘𝑌) ∧ 𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃)) → (𝐹:𝑋⟶𝑌 ∧ ∀𝑎 ∈ 𝐾 ((𝐹‘𝑃) ∈ 𝑎 → ∃𝑏 ∈ 𝐽 (𝑃 ∈ 𝑏 ∧ (𝐹 “ 𝑏) ⊆ 𝑎)))) |
| 8 | 7 | simpld 112 | 1 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐾 ∈ (TopOn‘𝑌) ∧ 𝐹 ∈ ((𝐽 CnP 𝐾)‘𝑃)) → 𝐹:𝑋⟶𝑌) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 ∧ w3a 981 ∈ wcel 2177 ∀wral 2485 ∃wrex 2486 ⊆ wss 3170 “ cima 4685 ⟶wf 5275 ‘cfv 5279 (class class class)co 5956 Topctop 14539 TopOnctopon 14552 CnP ccnp 14728 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-13 2179 ax-14 2180 ax-ext 2188 ax-coll 4166 ax-sep 4169 ax-pow 4225 ax-pr 4260 ax-un 4487 ax-setind 4592 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ne 2378 df-ral 2490 df-rex 2491 df-reu 2492 df-rab 2494 df-v 2775 df-sbc 3003 df-csb 3098 df-dif 3172 df-un 3174 df-in 3176 df-ss 3183 df-pw 3622 df-sn 3643 df-pr 3644 df-op 3646 df-uni 3856 df-iun 3934 df-br 4051 df-opab 4113 df-mpt 4114 df-id 4347 df-xp 4688 df-rel 4689 df-cnv 4690 df-co 4691 df-dm 4692 df-rn 4693 df-res 4694 df-ima 4695 df-iota 5240 df-fun 5281 df-fn 5282 df-f 5283 df-f1 5284 df-fo 5285 df-f1o 5286 df-fv 5287 df-ov 5959 df-oprab 5960 df-mpo 5961 df-1st 6238 df-2nd 6239 df-map 6749 df-top 14540 df-topon 14553 df-cnp 14731 |
| This theorem is referenced by: iscnp4 14760 cnptopco 14764 cncnp2m 14773 cnptopresti 14780 lmtopcnp 14792 txcnp 14813 metcnpi3 15059 cnplimcim 15209 limccnpcntop 15217 limccnp2lem 15218 limccnp2cntop 15219 |
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