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| Mirrors > Home > ILE Home > Th. List > sqrt2irr0 | GIF version | ||
| Description: The square root of 2 is not rational. (Contributed by AV, 23-Dec-2022.) |
| Ref | Expression |
|---|---|
| sqrt2irr0 | ⊢ (√‘2) ∈ (ℝ ∖ ℚ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sqrt2irr 12967 | . 2 ⊢ (√‘2) ∉ ℚ | |
| 2 | sqrt2re 12968 | . . . 4 ⊢ (√‘2) ∈ ℝ | |
| 3 | 2 | a1i 9 | . . 3 ⊢ ((√‘2) ∉ ℚ → (√‘2) ∈ ℝ) |
| 4 | df-nel 2516 | . . . 4 ⊢ ((√‘2) ∉ ℚ ↔ ¬ (√‘2) ∈ ℚ) | |
| 5 | 4 | biimpi 120 | . . 3 ⊢ ((√‘2) ∉ ℚ → ¬ (√‘2) ∈ ℚ) |
| 6 | 3, 5 | eldifd 3230 | . 2 ⊢ ((√‘2) ∉ ℚ → (√‘2) ∈ (ℝ ∖ ℚ)) |
| 7 | 1, 6 | ax-mp 5 | 1 ⊢ (√‘2) ∈ (ℝ ∖ ℚ) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ¬ wn 3 ∈ wcel 2209 ∉ wnel 2515 ∖ cdif 3217 ‘cfv 5380 ℝcr 8185 2c2 9365 ℚcq 10036 √csqrt 11785 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-coll 4248 ax-sep 4251 ax-nul 4261 ax-pow 4313 ax-pr 4348 ax-un 4580 ax-setind 4686 ax-iinf 4737 ax-cnex 8277 ax-resscn 8278 ax-1cn 8279 ax-1re 8280 ax-icn 8281 ax-addcl 8282 ax-addrcl 8283 ax-mulcl 8284 ax-mulrcl 8285 ax-addcom 8286 ax-mulcom 8287 ax-addass 8288 ax-mulass 8289 ax-distr 8290 ax-i2m1 8291 ax-0lt1 8292 ax-1rid 8293 ax-0id 8294 ax-rnegex 8295 ax-precex 8296 ax-cnre 8297 ax-pre-ltirr 8298 ax-pre-ltwlin 8299 ax-pre-lttrn 8300 ax-pre-apti 8301 ax-pre-ltadd 8302 ax-pre-mulgt0 8303 ax-pre-mulext 8304 ax-arch 8305 ax-caucvg 8306 |
| This proof depends on definitions: df-bi 117 df-dc 847 df-3or 1010 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-reu 2535 df-rmo 2536 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-if 3639 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-int 3971 df-iun 4014 df-br 4132 df-opab 4194 df-mpt 4195 df-tr 4232 df-id 4440 df-po 4443 df-iso 4444 df-iord 4513 df-on 4515 df-ilim 4516 df-suc 4518 df-iom 4740 df-xp 4782 df-rel 4783 df-cnv 4784 df-co 4785 df-dm 4786 df-rn 4787 df-res 4788 df-ima 4789 df-iota 5340 df-fun 5382 df-fn 5383 df-f 5384 df-f1 5385 df-fo 5386 df-f1o 5387 df-fv 5388 df-riota 6041 df-ov 6091 df-oprab 6092 df-mpo 6093 df-1st 6378 df-2nd 6379 df-recs 6580 df-frec 6666 df-pnf 8369 df-mnf 8370 df-xr 8371 df-ltxr 8372 df-le 8373 df-sub 8507 df-neg 8508 df-reap 8912 df-ap 8919 df-div 9012 df-inn 9315 df-2 9373 df-3 9374 df-4 9375 df-n0 9576 df-z 9657 df-uz 9939 df-q 10037 df-rp 10073 df-seqfrec 10907 df-exp 10998 df-rsqrt 11787 |
| This theorem is used by: 2irrexpq 16224 |
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