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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 12305 | . 2 ⊢ 9 = (8 + 1) | |
| 2 | 8cn 12333 | . . 3 ⊢ 8 ∈ ℂ | |
| 3 | ax-1cn 11153 | . . 3 ⊢ 1 ∈ ℂ | |
| 4 | 2, 3 | addcli 11210 | . 2 ⊢ (8 + 1) ∈ ℂ |
| 5 | 1, 4 | eqeltri 2859 | 1 ⊢ 9 ∈ ℂ |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2143 (class class class)co 7410 ℂcc 11093 1c1 11096 + caddc 11098 8c8 12296 9c9 12297 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-ext 2735 ax-1cn 11153 ax-addcl 11155 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-ex 1810 df-cleq 2755 df-clel 2838 df-2 12298 df-3 12299 df-4 12300 df-5 12301 df-6 12302 df-7 12303 df-8 12304 df-9 12305 |
| This theorem is referenced by: 10m1e9 12807 9t2e18 12833 9t8e72 12839 9t9e81 12840 9t11e99OLD 12842 0.999... 15931 cos2bnd 16239 3dvds 16384 3dvdsdec 16385 3dvds2dec 16386 2exp8 17143 139prm 17179 163prm 17180 317prm 17181 631prm 17182 1259lem1 17186 1259lem2 17187 1259lem3 17188 1259lem4 17189 1259lem5 17190 2503lem1 17192 2503lem2 17193 2503lem3 17194 2503prm 17195 4001lem1 17196 4001lem2 17197 4001lem3 17198 4001lem4 17199 sqrt2cxp2logb9e3 26964 mcubic 27012 cubic2 27013 cubic 27014 quartlem1 27022 log2tlbnd 27110 log2ublem3 27113 log2ub 27114 bposlem8 27455 ex-lcm 30809 9p10ne21 30821 1mhdrd 33235 hgt750lem2 35039 60gcd7e1 42792 3lexlogpow5ineq1 42841 3lexlogpow2ineq2 42846 3lexlogpow5ineq5 42847 25or6to4 42993 sq9 43079 sum9cubes 43424 fmtno5lem4 48328 257prm 48333 fmtno4nprmfac193 48346 139prmALT 48368 127prm 48371 8exp8mod9 48521 nfermltl8rev 48527 evengpop3 48583 |
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