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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 11865 | . 2 ⊢ 9 = (8 + 1) | |
2 | 8cn 11892 | . . 3 ⊢ 8 ∈ ℂ | |
3 | ax-1cn 10752 | . . 3 ⊢ 1 ∈ ℂ | |
4 | 2, 3 | addcli 10804 | . 2 ⊢ (8 + 1) ∈ ℂ |
5 | 1, 4 | eqeltri 2827 | 1 ⊢ 9 ∈ ℂ |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2112 (class class class)co 7191 ℂcc 10692 1c1 10695 + caddc 10697 8c8 11856 9c9 11857 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2018 ax-8 2114 ax-9 2122 ax-ext 2708 ax-1cn 10752 ax-addcl 10754 |
This theorem depends on definitions: df-bi 210 df-an 400 df-ex 1788 df-cleq 2728 df-clel 2809 df-2 11858 df-3 11859 df-4 11860 df-5 11861 df-6 11862 df-7 11863 df-8 11864 df-9 11865 |
This theorem is referenced by: 10m1e9 12354 9t2e18 12380 9t8e72 12386 9t9e81 12387 9t11e99 12388 0.999... 15408 cos2bnd 15712 3dvds 15855 3dvdsdec 15856 3dvds2dec 15857 2exp8 16605 139prm 16640 163prm 16641 317prm 16642 631prm 16643 1259lem1 16647 1259lem2 16648 1259lem3 16649 1259lem4 16650 1259lem5 16651 2503lem1 16653 2503lem2 16654 2503lem3 16655 2503prm 16656 4001lem1 16657 4001lem2 16658 4001lem3 16659 4001lem4 16660 sqrt2cxp2logb9e3 25636 mcubic 25684 cubic2 25685 cubic 25686 quartlem1 25694 log2tlbnd 25782 log2ublem3 25785 log2ub 25786 bposlem8 26126 ex-lcm 28495 9p10ne21 28507 1mhdrd 30864 hgt750lem2 32298 60gcd7e1 39696 3lexlogpow5ineq1 39745 3lexlogpow2ineq2 39750 3lexlogpow5ineq5 39751 fmtno5lem4 44624 257prm 44629 fmtno4nprmfac193 44642 139prmALT 44664 127prm 44667 8exp8mod9 44804 nfermltl8rev 44810 evengpop3 44866 |
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