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| Mirrors > Home > MPE Home > Th. List > Mathboxes > frege98 | Structured version Visualization version GIF version | ||
| Description: If 𝑌 follows 𝑋 and 𝑍 follows 𝑌 in the 𝑅-sequence then 𝑍 follows 𝑋 in the 𝑅-sequence because the transitive closure of a relation has the transitive property. Proposition 98 of [Frege1879] p. 71. (Contributed by RP, 2-Jul-2020.) (Revised by RP, 6-Jul-2020.) (Proof modification is discouraged.) |
| Ref | Expression |
|---|---|
| frege98.x | ⊢ 𝑋 ∈ 𝐴 |
| frege98.y | ⊢ 𝑌 ∈ 𝐵 |
| frege98.z | ⊢ 𝑍 ∈ 𝐶 |
| frege98.r | ⊢ 𝑅 ∈ 𝐷 |
| Ref | Expression |
|---|---|
| frege98 | ⊢ (𝑋(t+‘𝑅)𝑌 → (𝑌(t+‘𝑅)𝑍 → 𝑋(t+‘𝑅)𝑍)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | frege98.x | . . . 4 ⊢ 𝑋 ∈ 𝐴 | |
| 2 | frege98.r | . . . 4 ⊢ 𝑅 ∈ 𝐷 | |
| 3 | 1, 2 | frege97 44578 | . . 3 ⊢ 𝑅 hereditary ((t+‘𝑅) “ {𝑋}) |
| 4 | frege98.y | . . . 4 ⊢ 𝑌 ∈ 𝐵 | |
| 5 | frege98.z | . . . 4 ⊢ 𝑍 ∈ 𝐶 | |
| 6 | fvex 6895 | . . . . 5 ⊢ (t+‘𝑅) ∈ V | |
| 7 | imaexg 7910 | . . . . 5 ⊢ ((t+‘𝑅) ∈ V → ((t+‘𝑅) “ {𝑋}) ∈ V) | |
| 8 | 6, 7 | ax-mp 5 | . . . 4 ⊢ ((t+‘𝑅) “ {𝑋}) ∈ V |
| 9 | 4, 5, 2, 8 | frege84 44565 | . . 3 ⊢ (𝑅 hereditary ((t+‘𝑅) “ {𝑋}) → (𝑌 ∈ ((t+‘𝑅) “ {𝑋}) → (𝑌(t+‘𝑅)𝑍 → 𝑍 ∈ ((t+‘𝑅) “ {𝑋})))) |
| 10 | 3, 9 | ax-mp 5 | . 2 ⊢ (𝑌 ∈ ((t+‘𝑅) “ {𝑋}) → (𝑌(t+‘𝑅)𝑍 → 𝑍 ∈ ((t+‘𝑅) “ {𝑋}))) |
| 11 | 1 | elexi 3485 | . . . 4 ⊢ 𝑋 ∈ V |
| 12 | 4 | elexi 3485 | . . . 4 ⊢ 𝑌 ∈ V |
| 13 | 11, 12 | elimasn 6093 | . . 3 ⊢ (𝑌 ∈ ((t+‘𝑅) “ {𝑋}) ↔ 〈𝑋, 𝑌〉 ∈ (t+‘𝑅)) |
| 14 | df-br 5114 | . . 3 ⊢ (𝑋(t+‘𝑅)𝑌 ↔ 〈𝑋, 𝑌〉 ∈ (t+‘𝑅)) | |
| 15 | 13, 14 | bitr4i 281 | . 2 ⊢ (𝑌 ∈ ((t+‘𝑅) “ {𝑋}) ↔ 𝑋(t+‘𝑅)𝑌) |
| 16 | 5 | elexi 3485 | . . . . 5 ⊢ 𝑍 ∈ V |
| 17 | 11, 16 | elimasn 6093 | . . . 4 ⊢ (𝑍 ∈ ((t+‘𝑅) “ {𝑋}) ↔ 〈𝑋, 𝑍〉 ∈ (t+‘𝑅)) |
| 18 | df-br 5114 | . . . 4 ⊢ (𝑋(t+‘𝑅)𝑍 ↔ 〈𝑋, 𝑍〉 ∈ (t+‘𝑅)) | |
| 19 | 17, 18 | bitr4i 281 | . . 3 ⊢ (𝑍 ∈ ((t+‘𝑅) “ {𝑋}) ↔ 𝑋(t+‘𝑅)𝑍) |
| 20 | 19 | imbi2i 339 | . 2 ⊢ ((𝑌(t+‘𝑅)𝑍 → 𝑍 ∈ ((t+‘𝑅) “ {𝑋})) ↔ (𝑌(t+‘𝑅)𝑍 → 𝑋(t+‘𝑅)𝑍)) |
| 21 | 10, 15, 20 | 3imtr3i 294 | 1 ⊢ (𝑋(t+‘𝑅)𝑌 → (𝑌(t+‘𝑅)𝑍 → 𝑋(t+‘𝑅)𝑍)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2149 Vcvv 3463 {csn 4594 〈cop 4600 class class class wbr 5113 “ cima 5665 ‘cfv 6537 t+ctcl 15022 hereditary whe 44390 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-rep 5242 ax-sep 5261 ax-nul 5271 ax-pow 5337 ax-pr 5405 ax-un 7733 ax-cnex 11156 ax-resscn 11157 ax-1cn 11158 ax-icn 11159 ax-addcl 11160 ax-addrcl 11161 ax-mulcl 11162 ax-mulrcl 11163 ax-mulcom 11164 ax-addass 11165 ax-mulass 11166 ax-distr 11167 ax-i2m1 11168 ax-1ne0 11169 ax-1rid 11170 ax-rnegex 11171 ax-rrecex 11172 ax-cnre 11173 ax-pre-lttri 11174 ax-pre-lttrn 11175 ax-pre-ltadd 11176 ax-pre-mulgt0 11177 ax-frege1 44408 ax-frege2 44409 ax-frege8 44427 ax-frege52a 44475 ax-frege58b 44519 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-ifp 1077 df-3or 1102 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-nel 3071 df-ral 3086 df-rex 3096 df-reu 3377 df-rab 3424 df-v 3465 df-sbc 3754 df-csb 3862 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-pss 3933 df-nul 4295 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4877 df-int 4917 df-iun 4962 df-br 5114 df-opab 5178 df-mpt 5197 df-tr 5223 df-id 5557 df-eprel 5562 df-po 5570 df-so 5571 df-fr 5615 df-we 5617 df-xp 5668 df-rel 5669 df-cnv 5670 df-co 5671 df-dm 5672 df-rn 5673 df-res 5674 df-ima 5675 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7368 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7863 df-2nd 7987 df-frecs 8278 df-wrecs 8309 df-recs 8358 df-rdg 8397 df-er 8694 df-en 8944 df-dom 8945 df-sdom 8946 df-pnf 11245 df-mnf 11246 df-xr 11247 df-ltxr 11248 df-le 11249 df-sub 11443 df-neg 11444 df-nn 12234 df-2 12303 df-n0 12505 df-z 12592 df-uz 12863 df-seq 14038 df-trcl 15024 df-relexp 15057 df-he 44391 |
| This theorem is referenced by: (None) |
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