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Mirrors > Home > MPE Home > Th. List > 9p10ne21 | Structured version Visualization version GIF version |
Description: 9 + 10 is not equal to 21. This disproves a popular meme which asserts that 9 + 10 does equal 21. See https://www.quora.com/Can-someone-try-to-prove-to-me-that-9+10-21 for attempts to prove that 9 + 10 = 21, and see https://tinyurl.com/9p10e21 for the history of the 9 + 10 = 21 meme. (Contributed by BTernaryTau, 25-Aug-2023.) |
Ref | Expression |
---|---|
9p10ne21 | ⊢ (9 + ;10) ≠ ;21 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 10nn0 12117 | . . . 4 ⊢ ;10 ∈ ℕ0 | |
2 | 1 | nn0cni 11910 | . . 3 ⊢ ;10 ∈ ℂ |
3 | 9cn 11738 | . . 3 ⊢ 9 ∈ ℂ | |
4 | dec10p 12142 | . . 3 ⊢ (;10 + 9) = ;19 | |
5 | 2, 3, 4 | addcomli 10832 | . 2 ⊢ (9 + ;10) = ;19 |
6 | 1nn0 11914 | . . . . 5 ⊢ 1 ∈ ℕ0 | |
7 | 9nn0 11922 | . . . . 5 ⊢ 9 ∈ ℕ0 | |
8 | 6, 7 | deccl 12114 | . . . 4 ⊢ ;19 ∈ ℕ0 |
9 | 8 | nn0rei 11909 | . . 3 ⊢ ;19 ∈ ℝ |
10 | 2nn0 11915 | . . . 4 ⊢ 2 ∈ ℕ0 | |
11 | 9lt10 12230 | . . . 4 ⊢ 9 < ;10 | |
12 | 1lt2 11809 | . . . 4 ⊢ 1 < 2 | |
13 | 6, 10, 7, 6, 11, 12 | decltc 12128 | . . 3 ⊢ ;19 < ;21 |
14 | 9, 13 | ltneii 10753 | . 2 ⊢ ;19 ≠ ;21 |
15 | 5, 14 | eqnetri 3086 | 1 ⊢ (9 + ;10) ≠ ;21 |
Colors of variables: wff setvar class |
Syntax hints: ≠ wne 3016 (class class class)co 7156 0cc0 10537 1c1 10538 + caddc 10540 2c2 11693 9c9 11700 ;cdc 12099 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 ax-resscn 10594 ax-1cn 10595 ax-icn 10596 ax-addcl 10597 ax-addrcl 10598 ax-mulcl 10599 ax-mulrcl 10600 ax-mulcom 10601 ax-addass 10602 ax-mulass 10603 ax-distr 10604 ax-i2m1 10605 ax-1ne0 10606 ax-1rid 10607 ax-rnegex 10608 ax-rrecex 10609 ax-cnre 10610 ax-pre-lttri 10611 ax-pre-lttrn 10612 ax-pre-ltadd 10613 ax-pre-mulgt0 10614 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3496 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-tp 4572 df-op 4574 df-uni 4839 df-iun 4921 df-br 5067 df-opab 5129 df-mpt 5147 df-tr 5173 df-id 5460 df-eprel 5465 df-po 5474 df-so 5475 df-fr 5514 df-we 5516 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-pred 6148 df-ord 6194 df-on 6195 df-lim 6196 df-suc 6197 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-riota 7114 df-ov 7159 df-oprab 7160 df-mpo 7161 df-om 7581 df-wrecs 7947 df-recs 8008 df-rdg 8046 df-er 8289 df-en 8510 df-dom 8511 df-sdom 8512 df-pnf 10677 df-mnf 10678 df-xr 10679 df-ltxr 10680 df-le 10681 df-sub 10872 df-neg 10873 df-nn 11639 df-2 11701 df-3 11702 df-4 11703 df-5 11704 df-6 11705 df-7 11706 df-8 11707 df-9 11708 df-n0 11899 df-z 11983 df-dec 12100 |
This theorem is referenced by: 9p10ne21fool 28250 |
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