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| Mirrors > Home > MPE Home > Th. List > Mathboxes > frege97 | Structured version Visualization version GIF version | ||
| Description: The property of following
𝑋
in the 𝑅-sequence is hereditary
in the 𝑅-sequence. Proposition 97 of [Frege1879] p. 71.
Here we introduce the image of a singleton under a relation as class which stands for the property of following 𝑋 in the 𝑅 -sequence. (Contributed by RP, 2-Jul-2020.) (Revised by RP, 7-Jul-2020.) (Proof modification is discouraged.) |
| Ref | Expression |
|---|---|
| frege97.x | ⊢ 𝑋 ∈ 𝑈 |
| frege97.r | ⊢ 𝑅 ∈ 𝑊 |
| Ref | Expression |
|---|---|
| frege97 | ⊢ 𝑅 hereditary ((t+‘𝑅) “ {𝑋}) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | frege75 44283 | . 2 ⊢ (∀𝑏(𝑏 ∈ ((t+‘𝑅) “ {𝑋}) → ∀𝑎(𝑏𝑅𝑎 → 𝑎 ∈ ((t+‘𝑅) “ {𝑋}))) → 𝑅 hereditary ((t+‘𝑅) “ {𝑋})) | |
| 2 | frege97.x | . . . . 5 ⊢ 𝑋 ∈ 𝑈 | |
| 3 | vex 3446 | . . . . 5 ⊢ 𝑏 ∈ V | |
| 4 | vex 3446 | . . . . 5 ⊢ 𝑎 ∈ V | |
| 5 | frege97.r | . . . . 5 ⊢ 𝑅 ∈ 𝑊 | |
| 6 | 2, 3, 4, 5 | frege96 44304 | . . . 4 ⊢ (𝑋(t+‘𝑅)𝑏 → (𝑏𝑅𝑎 → 𝑋(t+‘𝑅)𝑎)) |
| 7 | df-br 5101 | . . . . 5 ⊢ (𝑋(t+‘𝑅)𝑏 ↔ 〈𝑋, 𝑏〉 ∈ (t+‘𝑅)) | |
| 8 | 2 | elexi 3465 | . . . . . 6 ⊢ 𝑋 ∈ V |
| 9 | 8, 3 | elimasn 6057 | . . . . 5 ⊢ (𝑏 ∈ ((t+‘𝑅) “ {𝑋}) ↔ 〈𝑋, 𝑏〉 ∈ (t+‘𝑅)) |
| 10 | 7, 9 | bitr4i 278 | . . . 4 ⊢ (𝑋(t+‘𝑅)𝑏 ↔ 𝑏 ∈ ((t+‘𝑅) “ {𝑋})) |
| 11 | df-br 5101 | . . . . . 6 ⊢ (𝑋(t+‘𝑅)𝑎 ↔ 〈𝑋, 𝑎〉 ∈ (t+‘𝑅)) | |
| 12 | 8, 4 | elimasn 6057 | . . . . . 6 ⊢ (𝑎 ∈ ((t+‘𝑅) “ {𝑋}) ↔ 〈𝑋, 𝑎〉 ∈ (t+‘𝑅)) |
| 13 | 11, 12 | bitr4i 278 | . . . . 5 ⊢ (𝑋(t+‘𝑅)𝑎 ↔ 𝑎 ∈ ((t+‘𝑅) “ {𝑋})) |
| 14 | 13 | imbi2i 336 | . . . 4 ⊢ ((𝑏𝑅𝑎 → 𝑋(t+‘𝑅)𝑎) ↔ (𝑏𝑅𝑎 → 𝑎 ∈ ((t+‘𝑅) “ {𝑋}))) |
| 15 | 6, 10, 14 | 3imtr3i 291 | . . 3 ⊢ (𝑏 ∈ ((t+‘𝑅) “ {𝑋}) → (𝑏𝑅𝑎 → 𝑎 ∈ ((t+‘𝑅) “ {𝑋}))) |
| 16 | 15 | alrimiv 1929 | . 2 ⊢ (𝑏 ∈ ((t+‘𝑅) “ {𝑋}) → ∀𝑎(𝑏𝑅𝑎 → 𝑎 ∈ ((t+‘𝑅) “ {𝑋}))) |
| 17 | 1, 16 | mpg 1799 | 1 ⊢ 𝑅 hereditary ((t+‘𝑅) “ {𝑋}) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∀wal 1540 ∈ wcel 2114 Vcvv 3442 {csn 4582 〈cop 4588 class class class wbr 5100 “ cima 5635 ‘cfv 6500 t+ctcl 14920 hereditary whe 44117 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5226 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115 ax-frege1 44135 ax-frege2 44136 ax-frege8 44154 ax-frege52a 44202 ax-frege58b 44246 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-ifp 1064 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-int 4905 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5527 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-we 5587 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-pred 6267 df-ord 6328 df-on 6329 df-lim 6330 df-suc 6331 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-riota 7325 df-ov 7371 df-oprab 7372 df-mpo 7373 df-om 7819 df-2nd 7944 df-frecs 8233 df-wrecs 8264 df-recs 8313 df-rdg 8351 df-er 8645 df-en 8896 df-dom 8897 df-sdom 8898 df-pnf 11180 df-mnf 11181 df-xr 11182 df-ltxr 11183 df-le 11184 df-sub 11378 df-neg 11379 df-nn 12158 df-2 12220 df-n0 12414 df-z 12501 df-uz 12764 df-seq 13937 df-trcl 14922 df-relexp 14955 df-he 44118 |
| This theorem is referenced by: frege98 44306 |
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