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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 12110 | . . . 4 ⊢ ;10 ∈ ℕ0 | |
2 | 1 | nn0cni 11903 | . . 3 ⊢ ;10 ∈ ℂ |
3 | 9cn 11731 | . . 3 ⊢ 9 ∈ ℂ | |
4 | dec10p 12135 | . . 3 ⊢ (;10 + 9) = ;19 | |
5 | 2, 3, 4 | addcomli 10825 | . 2 ⊢ (9 + ;10) = ;19 |
6 | 1nn0 11907 | . . . . 5 ⊢ 1 ∈ ℕ0 | |
7 | 9nn0 11915 | . . . . 5 ⊢ 9 ∈ ℕ0 | |
8 | 6, 7 | deccl 12107 | . . . 4 ⊢ ;19 ∈ ℕ0 |
9 | 8 | nn0rei 11902 | . . 3 ⊢ ;19 ∈ ℝ |
10 | 2nn0 11908 | . . . 4 ⊢ 2 ∈ ℕ0 | |
11 | 9lt10 12223 | . . . 4 ⊢ 9 < ;10 | |
12 | 1lt2 11802 | . . . 4 ⊢ 1 < 2 | |
13 | 6, 10, 7, 6, 11, 12 | decltc 12121 | . . 3 ⊢ ;19 < ;21 |
14 | 9, 13 | ltneii 10746 | . 2 ⊢ ;19 ≠ ;21 |
15 | 5, 14 | eqnetri 3085 | 1 ⊢ (9 + ;10) ≠ ;21 |
Colors of variables: wff setvar class |
Syntax hints: ≠ wne 3015 (class class class)co 7149 0cc0 10530 1c1 10531 + caddc 10533 2c2 11686 9c9 11693 ;cdc 12092 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2792 ax-sep 5196 ax-nul 5203 ax-pow 5259 ax-pr 5323 ax-un 7454 ax-resscn 10587 ax-1cn 10588 ax-icn 10589 ax-addcl 10590 ax-addrcl 10591 ax-mulcl 10592 ax-mulrcl 10593 ax-mulcom 10594 ax-addass 10595 ax-mulass 10596 ax-distr 10597 ax-i2m1 10598 ax-1ne0 10599 ax-1rid 10600 ax-rnegex 10601 ax-rrecex 10602 ax-cnre 10603 ax-pre-lttri 10604 ax-pre-lttrn 10605 ax-pre-ltadd 10606 ax-pre-mulgt0 10607 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1083 df-3an 1084 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-mo 2621 df-eu 2653 df-clab 2799 df-cleq 2813 df-clel 2892 df-nfc 2962 df-ne 3016 df-nel 3123 df-ral 3142 df-rex 3143 df-reu 3144 df-rab 3146 df-v 3493 df-sbc 3769 df-csb 3877 df-dif 3932 df-un 3934 df-in 3936 df-ss 3945 df-pss 3947 df-nul 4285 df-if 4461 df-pw 4534 df-sn 4561 df-pr 4563 df-tp 4565 df-op 4567 df-uni 4832 df-iun 4914 df-br 5060 df-opab 5122 df-mpt 5140 df-tr 5166 df-id 5453 df-eprel 5458 df-po 5467 df-so 5468 df-fr 5507 df-we 5509 df-xp 5554 df-rel 5555 df-cnv 5556 df-co 5557 df-dm 5558 df-rn 5559 df-res 5560 df-ima 5561 df-pred 6141 df-ord 6187 df-on 6188 df-lim 6189 df-suc 6190 df-iota 6307 df-fun 6350 df-fn 6351 df-f 6352 df-f1 6353 df-fo 6354 df-f1o 6355 df-fv 6356 df-riota 7107 df-ov 7152 df-oprab 7153 df-mpo 7154 df-om 7574 df-wrecs 7940 df-recs 8001 df-rdg 8039 df-er 8282 df-en 8503 df-dom 8504 df-sdom 8505 df-pnf 10670 df-mnf 10671 df-xr 10672 df-ltxr 10673 df-le 10674 df-sub 10865 df-neg 10866 df-nn 11632 df-2 11694 df-3 11695 df-4 11696 df-5 11697 df-6 11698 df-7 11699 df-8 11700 df-9 11701 df-n0 11892 df-z 11976 df-dec 12093 |
This theorem is referenced by: 9p10ne21fool 28246 |
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