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| Mirrors > Home > ILE Home > Th. List > 3halfnz | GIF version | ||
| Description: Three halves is not an integer. (Contributed by AV, 2-Jun-2020.) |
| Ref | Expression |
|---|---|
| 3halfnz | ⊢ ¬ (3 / 2) ∈ ℤ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1z 9682 | . 2 ⊢ 1 ∈ ℤ | |
| 2 | 2cn 9385 | . . . . 5 ⊢ 2 ∈ ℂ | |
| 3 | 2 | mullidi 8336 | . . . 4 ⊢ (1 · 2) = 2 |
| 4 | 2lt3 9487 | . . . 4 ⊢ 2 < 3 | |
| 5 | 3, 4 | eqbrtri 4152 | . . 3 ⊢ (1 · 2) < 3 |
| 6 | 1re 8332 | . . . 4 ⊢ 1 ∈ ℝ | |
| 7 | 3re 9388 | . . . 4 ⊢ 3 ∈ ℝ | |
| 8 | 2re 9384 | . . . . 5 ⊢ 2 ∈ ℝ | |
| 9 | 2pos 9405 | . . . . 5 ⊢ 0 < 2 | |
| 10 | 8, 9 | pm3.2i 272 | . . . 4 ⊢ (2 ∈ ℝ ∧ 0 < 2) |
| 11 | ltmuldiv 9213 | . . . 4 ⊢ ((1 ∈ ℝ ∧ 3 ∈ ℝ ∧ (2 ∈ ℝ ∧ 0 < 2)) → ((1 · 2) < 3 ↔ 1 < (3 / 2))) | |
| 12 | 6, 7, 10, 11 | mp3an 1378 | . . 3 ⊢ ((1 · 2) < 3 ↔ 1 < (3 / 2)) |
| 13 | 5, 12 | mpbi 145 | . 2 ⊢ 1 < (3 / 2) |
| 14 | 3lt4 9489 | . . . 4 ⊢ 3 < 4 | |
| 15 | 2t2e4 9469 | . . . . 5 ⊢ (2 · 2) = 4 | |
| 16 | 15 | breq2i 4139 | . . . 4 ⊢ (3 < (2 · 2) ↔ 3 < 4) |
| 17 | 14, 16 | mpbir 146 | . . 3 ⊢ 3 < (2 · 2) |
| 18 | 1p1e2 9431 | . . . . 5 ⊢ (1 + 1) = 2 | |
| 19 | 18 | breq2i 4139 | . . . 4 ⊢ ((3 / 2) < (1 + 1) ↔ (3 / 2) < 2) |
| 20 | ltdivmul 9215 | . . . . 5 ⊢ ((3 ∈ ℝ ∧ 2 ∈ ℝ ∧ (2 ∈ ℝ ∧ 0 < 2)) → ((3 / 2) < 2 ↔ 3 < (2 · 2))) | |
| 21 | 7, 8, 10, 20 | mp3an 1378 | . . . 4 ⊢ ((3 / 2) < 2 ↔ 3 < (2 · 2)) |
| 22 | 19, 21 | bitri 184 | . . 3 ⊢ ((3 / 2) < (1 + 1) ↔ 3 < (2 · 2)) |
| 23 | 17, 22 | mpbir 146 | . 2 ⊢ (3 / 2) < (1 + 1) |
| 24 | btwnnz 9752 | . 2 ⊢ ((1 ∈ ℤ ∧ 1 < (3 / 2) ∧ (3 / 2) < (1 + 1)) → ¬ (3 / 2) ∈ ℤ) | |
| 25 | 1, 13, 23, 24 | mp3an 1378 | 1 ⊢ ¬ (3 / 2) ∈ ℤ |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ¬ wn 3 ∧ wa 104 ↔ wb 105 ∈ wcel 2209 class class class wbr 4131 (class class class)co 6088 ℝcr 8185 0cc0 8186 1c1 8187 + caddc 8189 · cmul 8191 < clt 8367 / cdiv 9011 2c2 9365 3c3 9366 4c4 9367 ℤcz 9656 |
| 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-sep 4251 ax-pow 4313 ax-pr 4348 ax-un 4580 ax-setind 4686 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 |
| This proof depends on definitions: df-bi 117 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-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-int 3971 df-br 4132 df-opab 4194 df-id 4440 df-po 4443 df-iso 4444 df-xp 4782 df-rel 4783 df-cnv 4784 df-co 4785 df-dm 4786 df-iota 5340 df-fun 5382 df-fv 5388 df-riota 6041 df-ov 6091 df-oprab 6092 df-mpo 6093 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 |
| This theorem is used by: nn0o1gt2 12698 |
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