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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 11701 | . 2 ⊢ 9 = (8 + 1) | |
2 | 8cn 11728 | . . 3 ⊢ 8 ∈ ℂ | |
3 | ax-1cn 10589 | . . 3 ⊢ 1 ∈ ℂ | |
4 | 2, 3 | addcli 10641 | . 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 7150 ℂcc 10529 1c1 10532 + caddc 10534 8c8 11692 9c9 11693 |
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 10589 ax-addcl 10591 |
This theorem depends on definitions: df-bi 209 df-an 399 df-ex 1777 df-cleq 2814 df-clel 2893 df-2 11694 df-3 11695 df-4 11696 df-5 11697 df-6 11698 df-7 11699 df-8 11700 df-9 11701 |
This theorem is referenced by: 10m1e9 12188 9t2e18 12214 9t8e72 12220 9t9e81 12221 9t11e99 12222 0.999... 15231 cos2bnd 15535 3dvds 15674 3dvdsdec 15675 3dvds2dec 15676 2exp8 16417 139prm 16451 163prm 16452 317prm 16453 631prm 16454 1259lem1 16458 1259lem2 16459 1259lem3 16460 1259lem4 16461 1259lem5 16462 2503lem1 16464 2503lem2 16465 2503lem3 16466 2503prm 16467 4001lem1 16468 4001lem2 16469 4001lem3 16470 4001lem4 16471 sqrt2cxp2logb9e3 25371 mcubic 25419 cubic2 25420 cubic 25421 quartlem1 25429 log2tlbnd 25517 log2ublem3 25520 log2ub 25521 bposlem8 25861 ex-lcm 28231 9p10ne21 28243 1mhdrd 30587 hgt750lem2 31918 fmtno5lem4 43711 257prm 43716 fmtno4nprmfac193 43729 139prmALT 43752 127prm 43756 8exp8mod9 43894 nfermltl8rev 43900 evengpop3 43956 |
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