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| Mirrors > Home > MPE Home > Th. List > Mathboxes > lanrcl4 | Structured version Visualization version GIF version | ||
| Description: The first component of a left Kan extension is a functor. (Contributed by Zhi Wang, 4-Nov-2025.) |
| Ref | Expression |
|---|---|
| lanrcl2.l | ⊢ (𝜑 → 𝐿(𝐹(〈𝐶, 𝐷〉 Lan 𝐸)𝑋)𝐴) |
| Ref | Expression |
|---|---|
| lanrcl4 | ⊢ (𝜑 → 𝐿 ∈ (𝐷 Func 𝐸)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | lanrcl2.l | . . . . . 6 ⊢ (𝜑 → 𝐿(𝐹(〈𝐶, 𝐷〉 Lan 𝐸)𝑋)𝐴) | |
| 2 | df-br 5107 | . . . . . 6 ⊢ (𝐿(𝐹(〈𝐶, 𝐷〉 Lan 𝐸)𝑋)𝐴 ↔ 〈𝐿, 𝐴〉 ∈ (𝐹(〈𝐶, 𝐷〉 Lan 𝐸)𝑋)) | |
| 3 | 1, 2 | sylib 221 | . . . . 5 ⊢ (𝜑 → 〈𝐿, 𝐴〉 ∈ (𝐹(〈𝐶, 𝐷〉 Lan 𝐸)𝑋)) |
| 4 | eqid 2763 | . . . . . 6 ⊢ (𝐷 FuncCat 𝐸) = (𝐷 FuncCat 𝐸) | |
| 5 | eqid 2763 | . . . . . 6 ⊢ (𝐶 FuncCat 𝐸) = (𝐶 FuncCat 𝐸) | |
| 6 | eqid 2763 | . . . . . 6 ⊢ (〈𝐷, 𝐸〉 −∘F 𝐹) = (〈𝐷, 𝐸〉 −∘F 𝐹) | |
| 7 | 4, 5, 6 | islan 50953 | . . . . 5 ⊢ (〈𝐿, 𝐴〉 ∈ (𝐹(〈𝐶, 𝐷〉 Lan 𝐸)𝑋) → 〈𝐿, 𝐴〉 ∈ ((〈𝐷, 𝐸〉 −∘F 𝐹)((𝐷 FuncCat 𝐸) UP (𝐶 FuncCat 𝐸))𝑋)) |
| 8 | 3, 7 | syl 18 | . . . 4 ⊢ (𝜑 → 〈𝐿, 𝐴〉 ∈ ((〈𝐷, 𝐸〉 −∘F 𝐹)((𝐷 FuncCat 𝐸) UP (𝐶 FuncCat 𝐸))𝑋)) |
| 9 | df-br 5107 | . . . 4 ⊢ (𝐿((〈𝐷, 𝐸〉 −∘F 𝐹)((𝐷 FuncCat 𝐸) UP (𝐶 FuncCat 𝐸))𝑋)𝐴 ↔ 〈𝐿, 𝐴〉 ∈ ((〈𝐷, 𝐸〉 −∘F 𝐹)((𝐷 FuncCat 𝐸) UP (𝐶 FuncCat 𝐸))𝑋)) | |
| 10 | 8, 9 | sylibr 237 | . . 3 ⊢ (𝜑 → 𝐿((〈𝐷, 𝐸〉 −∘F 𝐹)((𝐷 FuncCat 𝐸) UP (𝐶 FuncCat 𝐸))𝑋)𝐴) |
| 11 | 10 | up1st2nd 50446 | . 2 ⊢ (𝜑 → 𝐿(〈(1st ‘(〈𝐷, 𝐸〉 −∘F 𝐹)), (2nd ‘(〈𝐷, 𝐸〉 −∘F 𝐹))〉((𝐷 FuncCat 𝐸) UP (𝐶 FuncCat 𝐸))𝑋)𝐴) |
| 12 | 4 | fucbas 18153 | . 2 ⊢ (𝐷 Func 𝐸) = (Base‘(𝐷 FuncCat 𝐸)) |
| 13 | 11, 12 | uprcl4 50452 | 1 ⊢ (𝜑 → 𝐿 ∈ (𝐷 Func 𝐸)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2146 〈cop 4838 class class class wbr 5106 ‘cfv 6547 (class class class)co 7430 1st c1st 8009 2nd c2nd 8010 Func cfunc 18044 FuncCat cfuc 18135 UP cup 50434 −∘F cprcof 50653 Lan clan 50933 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1944 ax-6 2001 ax-7 2042 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2196 ax-12 2215 ax-ext 2735 ax-rep 5235 ax-sep 5252 ax-nul 5263 ax-pow 5331 ax-pr 5395 ax-un 7761 ax-cnex 11269 ax-resscn 11270 ax-1cn 11271 ax-icn 11272 ax-addcl 11273 ax-addrcl 11274 ax-mulcl 11275 ax-mulrcl 11276 ax-mulcom 11277 ax-addass 11278 ax-mulass 11279 ax-distr 11280 ax-i2m1 11281 ax-1ne0 11282 ax-1rid 11283 ax-rnegex 11284 ax-rrecex 11285 ax-cnre 11286 ax-pre-lttri 11287 ax-pre-lttrn 11288 ax-pre-ltadd 11289 ax-pre-mulgt0 11290 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2101 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-tp 4593 df-op 4839 df-uni 4871 df-iun 4956 df-br 5107 df-opab 5171 df-mpt 5190 df-tr 5216 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6311 df-ord 6372 df-on 6373 df-lim 6374 df-suc 6375 df-iota 6501 df-fun 6549 df-fn 6550 df-f 6551 df-f1 6552 df-fo 6553 df-f1o 6554 df-fv 6555 df-riota 7387 df-ov 7433 df-oprab 7434 df-mpo 7435 df-om 7888 df-1st 8011 df-2nd 8012 df-frecs 8313 df-wrecs 8344 df-recs 8393 df-rdg 8432 df-1o 8490 df-er 8731 df-en 8988 df-dom 8989 df-sdom 8990 df-fin 8991 df-pnf 11358 df-mnf 11359 df-xr 11360 df-ltxr 11361 df-le 11362 df-sub 11556 df-neg 11557 df-nn 12349 df-2 12418 df-3 12419 df-4 12420 df-5 12421 df-6 12422 df-7 12423 df-8 12424 df-9 12425 df-n0 12620 df-z 12707 df-dec 12828 df-uz 12979 df-fz 13653 df-struct 17340 df-slot 17375 df-ndx 17387 df-base 17403 df-hom 17467 df-cco 17468 df-func 18048 df-fuc 18137 df-up 50435 df-lan 50935 |
| This theorem is used by: lanrcl5 50963 |
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