Mathbox for Alexander van der Vekens |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > ackval41a | Structured version Visualization version GIF version |
Description: The Ackermann function at (4,1). (Contributed by AV, 9-May-2024.) |
Ref | Expression |
---|---|
ackval41a | ⊢ ((Ack‘4)‘1) = ((2↑;16) − 3) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-4 11968 | . . . 4 ⊢ 4 = (3 + 1) | |
2 | 1 | fveq2i 6759 | . . 3 ⊢ (Ack‘4) = (Ack‘(3 + 1)) |
3 | 1e0p1 12408 | . . 3 ⊢ 1 = (0 + 1) | |
4 | 2, 3 | fveq12i 6762 | . 2 ⊢ ((Ack‘4)‘1) = ((Ack‘(3 + 1))‘(0 + 1)) |
5 | 3nn0 12181 | . . . 4 ⊢ 3 ∈ ℕ0 | |
6 | 0nn0 12178 | . . . 4 ⊢ 0 ∈ ℕ0 | |
7 | ackvalsucsucval 45922 | . . . 4 ⊢ ((3 ∈ ℕ0 ∧ 0 ∈ ℕ0) → ((Ack‘(3 + 1))‘(0 + 1)) = ((Ack‘3)‘((Ack‘(3 + 1))‘0))) | |
8 | 5, 6, 7 | mp2an 688 | . . 3 ⊢ ((Ack‘(3 + 1))‘(0 + 1)) = ((Ack‘3)‘((Ack‘(3 + 1))‘0)) |
9 | 3p1e4 12048 | . . . . . . . 8 ⊢ (3 + 1) = 4 | |
10 | 9 | fveq2i 6759 | . . . . . . 7 ⊢ (Ack‘(3 + 1)) = (Ack‘4) |
11 | 10 | fveq1i 6757 | . . . . . 6 ⊢ ((Ack‘(3 + 1))‘0) = ((Ack‘4)‘0) |
12 | ackval40 45927 | . . . . . 6 ⊢ ((Ack‘4)‘0) = ;13 | |
13 | 11, 12 | eqtri 2766 | . . . . 5 ⊢ ((Ack‘(3 + 1))‘0) = ;13 |
14 | 13 | fveq2i 6759 | . . . 4 ⊢ ((Ack‘3)‘((Ack‘(3 + 1))‘0)) = ((Ack‘3)‘;13) |
15 | 1nn0 12179 | . . . . . 6 ⊢ 1 ∈ ℕ0 | |
16 | 15, 5 | deccl 12381 | . . . . 5 ⊢ ;13 ∈ ℕ0 |
17 | oveq1 7262 | . . . . . . . . 9 ⊢ (𝑛 = ;13 → (𝑛 + 3) = (;13 + 3)) | |
18 | 17 | oveq2d 7271 | . . . . . . . 8 ⊢ (𝑛 = ;13 → (2↑(𝑛 + 3)) = (2↑(;13 + 3))) |
19 | 18 | oveq1d 7270 | . . . . . . 7 ⊢ (𝑛 = ;13 → ((2↑(𝑛 + 3)) − 3) = ((2↑(;13 + 3)) − 3)) |
20 | eqid 2738 | . . . . . . . . . 10 ⊢ ;13 = ;13 | |
21 | 3p3e6 12055 | . . . . . . . . . 10 ⊢ (3 + 3) = 6 | |
22 | 15, 5, 5, 20, 21 | decaddi 12426 | . . . . . . . . 9 ⊢ (;13 + 3) = ;16 |
23 | 22 | oveq2i 7266 | . . . . . . . 8 ⊢ (2↑(;13 + 3)) = (2↑;16) |
24 | 23 | oveq1i 7265 | . . . . . . 7 ⊢ ((2↑(;13 + 3)) − 3) = ((2↑;16) − 3) |
25 | 19, 24 | eqtrdi 2795 | . . . . . 6 ⊢ (𝑛 = ;13 → ((2↑(𝑛 + 3)) − 3) = ((2↑;16) − 3)) |
26 | ackval3 45917 | . . . . . 6 ⊢ (Ack‘3) = (𝑛 ∈ ℕ0 ↦ ((2↑(𝑛 + 3)) − 3)) | |
27 | ovex 7288 | . . . . . 6 ⊢ ((2↑;16) − 3) ∈ V | |
28 | 25, 26, 27 | fvmpt 6857 | . . . . 5 ⊢ (;13 ∈ ℕ0 → ((Ack‘3)‘;13) = ((2↑;16) − 3)) |
29 | 16, 28 | ax-mp 5 | . . . 4 ⊢ ((Ack‘3)‘;13) = ((2↑;16) − 3) |
30 | 14, 29 | eqtri 2766 | . . 3 ⊢ ((Ack‘3)‘((Ack‘(3 + 1))‘0)) = ((2↑;16) − 3) |
31 | 8, 30 | eqtri 2766 | . 2 ⊢ ((Ack‘(3 + 1))‘(0 + 1)) = ((2↑;16) − 3) |
32 | 4, 31 | eqtri 2766 | 1 ⊢ ((Ack‘4)‘1) = ((2↑;16) − 3) |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1539 ∈ wcel 2108 ‘cfv 6418 (class class class)co 7255 0cc0 10802 1c1 10803 + caddc 10805 − cmin 11135 2c2 11958 3c3 11959 4c4 11960 6c6 11962 ℕ0cn0 12163 ;cdc 12366 ↑cexp 13710 Ackcack 45892 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-rep 5205 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-inf2 9329 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-ot 4567 df-uni 4837 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-om 7688 df-2nd 7805 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-er 8456 df-en 8692 df-dom 8693 df-sdom 8694 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-nn 11904 df-2 11966 df-3 11967 df-4 11968 df-5 11969 df-6 11970 df-7 11971 df-8 11972 df-9 11973 df-n0 12164 df-z 12250 df-dec 12367 df-uz 12512 df-seq 13650 df-exp 13711 df-itco 45893 df-ack 45894 |
This theorem is referenced by: ackval41 45929 ackval42 45930 |
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