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Mirrors > Home > MPE Home > Th. List > 9cn | Structured version Visualization version GIF version |
Description: The number 9 is a complex number. (Contributed by David A. Wheeler, 8-Dec-2018.) Reduce dependencies on axioms. (Revised by Steven Nguyen, 4-Oct-2022.) |
Ref | Expression |
---|---|
9cn | ⊢ 9 ∈ ℂ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-9 11706 | . 2 ⊢ 9 = (8 + 1) | |
2 | 8cn 11733 | . . 3 ⊢ 8 ∈ ℂ | |
3 | ax-1cn 10594 | . . 3 ⊢ 1 ∈ ℂ | |
4 | 2, 3 | addcli 10646 | . 2 ⊢ (8 + 1) ∈ ℂ |
5 | 1, 4 | eqeltri 2909 | 1 ⊢ 9 ∈ ℂ |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2110 (class class class)co 7155 ℂcc 10534 1c1 10537 + caddc 10539 8c8 11697 9c9 11698 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-ext 2793 ax-1cn 10594 ax-addcl 10596 |
This theorem depends on definitions: df-bi 209 df-an 399 df-ex 1777 df-cleq 2814 df-clel 2893 df-2 11699 df-3 11700 df-4 11701 df-5 11702 df-6 11703 df-7 11704 df-8 11705 df-9 11706 |
This theorem is referenced by: 10m1e9 12193 9t2e18 12219 9t8e72 12225 9t9e81 12226 9t11e99 12227 0.999... 15236 cos2bnd 15540 3dvds 15679 3dvdsdec 15680 3dvds2dec 15681 2exp8 16422 139prm 16456 163prm 16457 317prm 16458 631prm 16459 1259lem1 16463 1259lem2 16464 1259lem3 16465 1259lem4 16466 1259lem5 16467 2503lem1 16469 2503lem2 16470 2503lem3 16471 2503prm 16472 4001lem1 16473 4001lem2 16474 4001lem3 16475 4001lem4 16476 sqrt2cxp2logb9e3 25376 mcubic 25424 cubic2 25425 cubic 25426 quartlem1 25434 log2tlbnd 25522 log2ublem3 25525 log2ub 25526 bposlem8 25866 ex-lcm 28236 9p10ne21 28248 1mhdrd 30592 hgt750lem2 31923 fmtno5lem4 43717 257prm 43722 fmtno4nprmfac193 43735 139prmALT 43758 127prm 43762 8exp8mod9 43900 nfermltl8rev 43906 evengpop3 43962 |
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