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| Mirrors > Home > ILE Home > Th. List > cnmpt21f | GIF version | ||
| Description: The composition of continuous functions is continuous. (Contributed by Mario Carneiro, 5-May-2014.) (Revised by Mario Carneiro, 22-Aug-2015.) |
| Ref | Expression |
|---|---|
| cnmpt21.j | ⊢ (𝜑 → 𝐽 ∈ (TopOn‘𝑋)) |
| cnmpt21.k | ⊢ (𝜑 → 𝐾 ∈ (TopOn‘𝑌)) |
| cnmpt21.a | ⊢ (𝜑 → (𝑥 ∈ 𝑋, 𝑦 ∈ 𝑌 ↦ 𝐴) ∈ ((𝐽 ×t 𝐾) Cn 𝐿)) |
| cnmpt21f.f | ⊢ (𝜑 → 𝐹 ∈ (𝐿 Cn 𝑀)) |
| Ref | Expression |
|---|---|
| cnmpt21f | ⊢ (𝜑 → (𝑥 ∈ 𝑋, 𝑦 ∈ 𝑌 ↦ (𝐹‘𝐴)) ∈ ((𝐽 ×t 𝐾) Cn 𝑀)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cnmpt21.j | . 2 ⊢ (𝜑 → 𝐽 ∈ (TopOn‘𝑋)) | |
| 2 | cnmpt21.k | . 2 ⊢ (𝜑 → 𝐾 ∈ (TopOn‘𝑌)) | |
| 3 | cnmpt21.a | . 2 ⊢ (𝜑 → (𝑥 ∈ 𝑋, 𝑦 ∈ 𝑌 ↦ 𝐴) ∈ ((𝐽 ×t 𝐾) Cn 𝐿)) | |
| 4 | cnmpt21f.f | . . . 4 ⊢ (𝜑 → 𝐹 ∈ (𝐿 Cn 𝑀)) | |
| 5 | cntop1 14924 | . . . 4 ⊢ (𝐹 ∈ (𝐿 Cn 𝑀) → 𝐿 ∈ Top) | |
| 6 | 4, 5 | syl 14 | . . 3 ⊢ (𝜑 → 𝐿 ∈ Top) |
| 7 | toptopon2 14742 | . . 3 ⊢ (𝐿 ∈ Top ↔ 𝐿 ∈ (TopOn‘∪ 𝐿)) | |
| 8 | 6, 7 | sylib 122 | . 2 ⊢ (𝜑 → 𝐿 ∈ (TopOn‘∪ 𝐿)) |
| 9 | eqid 2231 | . . . . . 6 ⊢ ∪ 𝐿 = ∪ 𝐿 | |
| 10 | eqid 2231 | . . . . . 6 ⊢ ∪ 𝑀 = ∪ 𝑀 | |
| 11 | 9, 10 | cnf 14927 | . . . . 5 ⊢ (𝐹 ∈ (𝐿 Cn 𝑀) → 𝐹:∪ 𝐿⟶∪ 𝑀) |
| 12 | 4, 11 | syl 14 | . . . 4 ⊢ (𝜑 → 𝐹:∪ 𝐿⟶∪ 𝑀) |
| 13 | 12 | feqmptd 5699 | . . 3 ⊢ (𝜑 → 𝐹 = (𝑧 ∈ ∪ 𝐿 ↦ (𝐹‘𝑧))) |
| 14 | 13, 4 | eqeltrrd 2309 | . 2 ⊢ (𝜑 → (𝑧 ∈ ∪ 𝐿 ↦ (𝐹‘𝑧)) ∈ (𝐿 Cn 𝑀)) |
| 15 | fveq2 5639 | . 2 ⊢ (𝑧 = 𝐴 → (𝐹‘𝑧) = (𝐹‘𝐴)) | |
| 16 | 1, 2, 3, 8, 14, 15 | cnmpt21 15014 | 1 ⊢ (𝜑 → (𝑥 ∈ 𝑋, 𝑦 ∈ 𝑌 ↦ (𝐹‘𝐴)) ∈ ((𝐽 ×t 𝐾) Cn 𝑀)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∈ wcel 2202 ∪ cuni 3893 ↦ cmpt 4150 ⟶wf 5322 ‘cfv 5326 (class class class)co 6017 ∈ cmpo 6019 Topctop 14720 TopOnctopon 14733 Cn ccn 14908 ×t ctx 14975 |
| 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 619 ax-in2 620 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2204 ax-14 2205 ax-ext 2213 ax-coll 4204 ax-sep 4207 ax-pow 4264 ax-pr 4299 ax-un 4530 ax-setind 4635 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ne 2403 df-ral 2515 df-rex 2516 df-reu 2517 df-rab 2519 df-v 2804 df-sbc 3032 df-csb 3128 df-dif 3202 df-un 3204 df-in 3206 df-ss 3213 df-pw 3654 df-sn 3675 df-pr 3676 df-op 3678 df-uni 3894 df-iun 3972 df-br 4089 df-opab 4151 df-mpt 4152 df-id 4390 df-xp 4731 df-rel 4732 df-cnv 4733 df-co 4734 df-dm 4735 df-rn 4736 df-res 4737 df-ima 4738 df-iota 5286 df-fun 5328 df-fn 5329 df-f 5330 df-f1 5331 df-fo 5332 df-f1o 5333 df-fv 5334 df-ov 6020 df-oprab 6021 df-mpo 6022 df-1st 6302 df-2nd 6303 df-map 6818 df-topgen 13342 df-top 14721 df-topon 14734 df-bases 14766 df-cn 14911 df-tx 14976 |
| This theorem is referenced by: cnmpt22 15017 txhmeo 15042 |
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