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| Mirrors > Home > MPE Home > Th. List > rtrclind | Structured version Visualization version GIF version | ||
| Description: Principle of transitive induction. The first three hypotheses give various existences, the next four give necessary substitutions and the last two are the basis and the induction step. (Contributed by Drahflow, 12-Nov-2015.) (Revised by AV, 13-Jul-2024.) |
| Ref | Expression |
|---|---|
| rtrclind.1 | ⊢ (𝜂 → Rel 𝑅) |
| rtrclind.2 | ⊢ (𝜂 → 𝑆 ∈ 𝑉) |
| rtrclind.3 | ⊢ (𝜂 → 𝑋 ∈ 𝑊) |
| rtrclind.4 | ⊢ (𝑖 = 𝑆 → (𝜑 ↔ 𝜒)) |
| rtrclind.5 | ⊢ (𝑖 = 𝑥 → (𝜑 ↔ 𝜓)) |
| rtrclind.6 | ⊢ (𝑖 = 𝑗 → (𝜑 ↔ 𝜃)) |
| rtrclind.7 | ⊢ (𝑥 = 𝑋 → (𝜓 ↔ 𝜏)) |
| rtrclind.8 | ⊢ (𝜂 → 𝜒) |
| rtrclind.9 | ⊢ (𝜂 → (𝑗𝑅𝑥 → (𝜃 → 𝜓))) |
| Ref | Expression |
|---|---|
| rtrclind | ⊢ (𝜂 → (𝑆(t*‘𝑅)𝑋 → 𝜏)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | rtrclind.1 | . . 3 ⊢ (𝜂 → Rel 𝑅) | |
| 2 | 1 | dfrtrcl2 15221 | . 2 ⊢ (𝜂 → (t*‘𝑅) = (t*rec‘𝑅)) |
| 3 | 1 | dfrtrclrec2 15217 | . . . . . 6 ⊢ (𝜂 → (𝑆(t*rec‘𝑅)𝑋 ↔ ∃𝑛 ∈ ℕ0 𝑆(𝑅↑𝑟𝑛)𝑋)) |
| 4 | 3 | biimpac 484 | . . . . 5 ⊢ ((𝑆(t*rec‘𝑅)𝑋 ∧ 𝜂) → ∃𝑛 ∈ ℕ0 𝑆(𝑅↑𝑟𝑛)𝑋) |
| 5 | simprl 783 | . . . . . . . . . 10 ⊢ ((𝑆(t*rec‘𝑅)𝑋 ∧ (𝜂 ∧ (𝑆(𝑅↑𝑟𝑛)𝑋 ∧ 𝑛 ∈ ℕ0))) → 𝜂) | |
| 6 | simprrr 794 | . . . . . . . . . 10 ⊢ ((𝑆(t*rec‘𝑅)𝑋 ∧ (𝜂 ∧ (𝑆(𝑅↑𝑟𝑛)𝑋 ∧ 𝑛 ∈ ℕ0))) → 𝑛 ∈ ℕ0) | |
| 7 | simprrl 793 | . . . . . . . . . 10 ⊢ ((𝑆(t*rec‘𝑅)𝑋 ∧ (𝜂 ∧ (𝑆(𝑅↑𝑟𝑛)𝑋 ∧ 𝑛 ∈ ℕ0))) → 𝑆(𝑅↑𝑟𝑛)𝑋) | |
| 8 | rtrclind.2 | . . . . . . . . . . 11 ⊢ (𝜂 → 𝑆 ∈ 𝑉) | |
| 9 | rtrclind.3 | . . . . . . . . . . 11 ⊢ (𝜂 → 𝑋 ∈ 𝑊) | |
| 10 | rtrclind.4 | . . . . . . . . . . 11 ⊢ (𝑖 = 𝑆 → (𝜑 ↔ 𝜒)) | |
| 11 | rtrclind.5 | . . . . . . . . . . 11 ⊢ (𝑖 = 𝑥 → (𝜑 ↔ 𝜓)) | |
| 12 | rtrclind.6 | . . . . . . . . . . 11 ⊢ (𝑖 = 𝑗 → (𝜑 ↔ 𝜃)) | |
| 13 | rtrclind.7 | . . . . . . . . . . 11 ⊢ (𝑥 = 𝑋 → (𝜓 ↔ 𝜏)) | |
| 14 | rtrclind.8 | . . . . . . . . . . 11 ⊢ (𝜂 → 𝜒) | |
| 15 | rtrclind.9 | . . . . . . . . . . 11 ⊢ (𝜂 → (𝑗𝑅𝑥 → (𝜃 → 𝜓))) | |
| 16 | 1, 8, 9, 10, 11, 12, 13, 14, 15 | relexpind 15223 | . . . . . . . . . 10 ⊢ (𝜂 → (𝑛 ∈ ℕ0 → (𝑆(𝑅↑𝑟𝑛)𝑋 → 𝜏))) |
| 17 | 5, 6, 7, 16 | syl3c 67 | . . . . . . . . 9 ⊢ ((𝑆(t*rec‘𝑅)𝑋 ∧ (𝜂 ∧ (𝑆(𝑅↑𝑟𝑛)𝑋 ∧ 𝑛 ∈ ℕ0))) → 𝜏) |
| 18 | 17 | anassrs 473 | . . . . . . . 8 ⊢ (((𝑆(t*rec‘𝑅)𝑋 ∧ 𝜂) ∧ (𝑆(𝑅↑𝑟𝑛)𝑋 ∧ 𝑛 ∈ ℕ0)) → 𝜏) |
| 19 | 18 | expcom 419 | . . . . . . 7 ⊢ ((𝑆(𝑅↑𝑟𝑛)𝑋 ∧ 𝑛 ∈ ℕ0) → ((𝑆(t*rec‘𝑅)𝑋 ∧ 𝜂) → 𝜏)) |
| 20 | 19 | expcom 419 | . . . . . 6 ⊢ (𝑛 ∈ ℕ0 → (𝑆(𝑅↑𝑟𝑛)𝑋 → ((𝑆(t*rec‘𝑅)𝑋 ∧ 𝜂) → 𝜏))) |
| 21 | 20 | rexlimiv 3156 | . . . . 5 ⊢ (∃𝑛 ∈ ℕ0 𝑆(𝑅↑𝑟𝑛)𝑋 → ((𝑆(t*rec‘𝑅)𝑋 ∧ 𝜂) → 𝜏)) |
| 22 | 4, 21 | mpcom 39 | . . . 4 ⊢ ((𝑆(t*rec‘𝑅)𝑋 ∧ 𝜂) → 𝜏) |
| 23 | 22 | expcom 419 | . . 3 ⊢ (𝜂 → (𝑆(t*rec‘𝑅)𝑋 → 𝜏)) |
| 24 | breq 5104 | . . . 4 ⊢ ((t*‘𝑅) = (t*rec‘𝑅) → (𝑆(t*‘𝑅)𝑋 ↔ 𝑆(t*rec‘𝑅)𝑋)) | |
| 25 | 24 | imbi1d 344 | . . 3 ⊢ ((t*‘𝑅) = (t*rec‘𝑅) → ((𝑆(t*‘𝑅)𝑋 → 𝜏) ↔ (𝑆(t*rec‘𝑅)𝑋 → 𝜏))) |
| 26 | 23, 25 | imbitrrid 249 | . 2 ⊢ ((t*‘𝑅) = (t*rec‘𝑅) → (𝜂 → (𝑆(t*‘𝑅)𝑋 → 𝜏))) |
| 27 | 2, 26 | mpcom 39 | 1 ⊢ (𝜂 → (𝑆(t*‘𝑅)𝑋 → 𝜏)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1569 ∈ wcel 2144 ∃wrex 3086 class class class wbr 5102 Rel wrel 5655 ‘cfv 6539 (class class class)co 7421 ℕ0cn0 12610 t*crtcl 15145 ↑𝑟crelexp 15178 t*reccrtrcl 15214 |
| 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 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7752 ax-cnex 11260 ax-resscn 11261 ax-1cn 11262 ax-icn 11263 ax-addcl 11264 ax-addrcl 11265 ax-mulcl 11266 ax-mulrcl 11267 ax-mulcom 11268 ax-addass 11269 ax-mulass 11270 ax-distr 11271 ax-i2m1 11272 ax-1ne0 11273 ax-1rid 11274 ax-rnegex 11275 ax-rrecex 11276 ax-cnre 11277 ax-pre-lttri 11278 ax-pre-lttrn 11279 ax-pre-ltadd 11280 ax-pre-mulgt0 11281 |
| 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 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-ss 3896 df-pss 4014 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-int 4907 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6541 df-fn 6542 df-f 6543 df-f1 6544 df-fo 6545 df-f1o 6546 df-fv 6547 df-riota 7378 df-ov 7424 df-oprab 7425 df-mpo 7426 df-om 7879 df-2nd 8003 df-frecs 8303 df-wrecs 8334 df-recs 8383 df-rdg 8422 df-er 8721 df-en 8978 df-dom 8979 df-sdom 8980 df-pnf 11349 df-mnf 11350 df-xr 11351 df-ltxr 11352 df-le 11353 df-sub 11547 df-neg 11548 df-nn 12340 df-2 12409 df-n0 12611 df-z 12698 df-uz 12970 df-seq 14149 df-rtrcl 15147 df-relexp 15179 df-rtrclrec 15215 |
| This theorem is used by: (None) |
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