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| Mirrors > Home > MPE Home > Th. List > nthruc | Structured version Visualization version GIF version | ||
| Description: The sequence ℕ, ℤ, ℚ, ℝ, and ℂ forms a chain of proper subsets. In each case the proper subset relationship is shown by demonstrating a number that belongs to one set but not the other. We show that zero belongs to ℤ but not ℕ, one-half belongs to ℚ but not ℤ, the square root of 2 belongs to ℝ but not ℚ, and finally that the imaginary number i belongs to ℂ but not ℝ. See nthruz 16421 for a further refinement. (Contributed by NM, 12-Jan-2002.) |
| Ref | Expression |
|---|---|
| nthruc | ⊢ ((ℕ ⊊ ℤ ∧ ℤ ⊊ ℚ) ∧ (ℚ ⊊ ℝ ∧ ℝ ⊊ ℂ)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nnssz 12715 | . . . 4 ⊢ ℕ ⊆ ℤ | |
| 2 | 0z 12704 | . . . . 5 ⊢ 0 ∈ ℤ | |
| 3 | 0nnn 12374 | . . . . 5 ⊢ ¬ 0 ∈ ℕ | |
| 4 | 2, 3 | pm3.2i 476 | . . . 4 ⊢ (0 ∈ ℤ ∧ ¬ 0 ∈ ℕ) |
| 5 | ssnelpss 4042 | . . . 4 ⊢ (ℕ ⊆ ℤ → ((0 ∈ ℤ ∧ ¬ 0 ∈ ℕ) → ℕ ⊊ ℤ)) | |
| 6 | 1, 4, 5 | mp2 9 | . . 3 ⊢ ℕ ⊊ ℤ |
| 7 | zssq 13083 | . . . 4 ⊢ ℤ ⊆ ℚ | |
| 8 | 1z 12726 | . . . . . 6 ⊢ 1 ∈ ℤ | |
| 9 | 2nn 12416 | . . . . . 6 ⊢ 2 ∈ ℕ | |
| 10 | znq 13079 | . . . . . 6 ⊢ ((1 ∈ ℤ ∧ 2 ∈ ℕ) → (1 / 2) ∈ ℚ) | |
| 11 | 8, 9, 10 | mp2an 705 | . . . . 5 ⊢ (1 / 2) ∈ ℚ |
| 12 | halfnz 12777 | . . . . 5 ⊢ ¬ (1 / 2) ∈ ℤ | |
| 13 | 11, 12 | pm3.2i 476 | . . . 4 ⊢ ((1 / 2) ∈ ℚ ∧ ¬ (1 / 2) ∈ ℤ) |
| 14 | ssnelpss 4042 | . . . 4 ⊢ (ℤ ⊆ ℚ → (((1 / 2) ∈ ℚ ∧ ¬ (1 / 2) ∈ ℤ) → ℤ ⊊ ℚ)) | |
| 15 | 7, 13, 14 | mp2 9 | . . 3 ⊢ ℤ ⊊ ℚ |
| 16 | 6, 15 | pm3.2i 476 | . 2 ⊢ (ℕ ⊊ ℤ ∧ ℤ ⊊ ℚ) |
| 17 | qssre 13086 | . . . 4 ⊢ ℚ ⊆ ℝ | |
| 18 | sqrt2re 16418 | . . . . 5 ⊢ (√‘2) ∈ ℝ | |
| 19 | sqrt2irr 16417 | . . . . . 6 ⊢ (√‘2) ∉ ℚ | |
| 20 | 19 | neli 3063 | . . . . 5 ⊢ ¬ (√‘2) ∈ ℚ |
| 21 | 18, 20 | pm3.2i 476 | . . . 4 ⊢ ((√‘2) ∈ ℝ ∧ ¬ (√‘2) ∈ ℚ) |
| 22 | ssnelpss 4042 | . . . 4 ⊢ (ℚ ⊆ ℝ → (((√‘2) ∈ ℝ ∧ ¬ (√‘2) ∈ ℚ) → ℚ ⊊ ℝ)) | |
| 23 | 17, 21, 22 | mp2 9 | . . 3 ⊢ ℚ ⊊ ℝ |
| 24 | ax-resscn 11257 | . . . 4 ⊢ ℝ ⊆ ℂ | |
| 25 | ax-icn 11259 | . . . . 5 ⊢ i ∈ ℂ | |
| 26 | inelr 12310 | . . . . 5 ⊢ ¬ i ∈ ℝ | |
| 27 | 25, 26 | pm3.2i 476 | . . . 4 ⊢ (i ∈ ℂ ∧ ¬ i ∈ ℝ) |
| 28 | ssnelpss 4042 | . . . 4 ⊢ (ℝ ⊆ ℂ → ((i ∈ ℂ ∧ ¬ i ∈ ℝ) → ℝ ⊊ ℂ)) | |
| 29 | 24, 27, 28 | mp2 9 | . . 3 ⊢ ℝ ⊊ ℂ |
| 30 | 23, 29 | pm3.2i 476 | . 2 ⊢ (ℚ ⊊ ℝ ∧ ℝ ⊊ ℂ) |
| 31 | 16, 30 | pm3.2i 476 | 1 ⊢ ((ℕ ⊊ ℤ ∧ ℤ ⊊ ℚ) ∧ (ℚ ⊊ ℝ ∧ ℝ ⊊ ℂ)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 ∧ wa 401 ∈ wcel 2144 ⊆ wss 3895 ⊊ wpss 4013 ‘cfv 6538 (class class class)co 7420 ℂcc 11198 ℝcr 11199 0cc0 11200 1c1 11201 ici 11202 / cdiv 11973 ℕcn 12335 2c2 12397 ℤcz 12693 ℚcq 13075 √csqrt 15400 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7751 ax-cnex 11256 ax-resscn 11257 ax-1cn 11258 ax-icn 11259 ax-addcl 11260 ax-addrcl 11261 ax-mulcl 11262 ax-mulrcl 11263 ax-mulcom 11264 ax-addass 11265 ax-mulass 11266 ax-distr 11267 ax-i2m1 11268 ax-1ne0 11269 ax-1rid 11270 ax-rnegex 11271 ax-rrecex 11272 ax-cnre 11273 ax-pre-lttri 11274 ax-pre-lttrn 11275 ax-pre-ltadd 11276 ax-pre-mulgt0 11277 ax-pre-sup 11278 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-ss 3896 df-pss 4014 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4584 df-pr 4586 df-op 4590 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-riota 7377 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7878 df-1st 8001 df-2nd 8002 df-frecs 8299 df-wrecs 8330 df-recs 8379 df-rdg 8418 df-er 8717 df-en 8974 df-dom 8975 df-sdom 8976 df-sup 9434 df-pnf 11345 df-mnf 11346 df-xr 11347 df-ltxr 11348 df-le 11349 df-sub 11543 df-neg 11544 df-div 11974 df-nn 12336 df-2 12405 df-3 12406 df-n0 12607 df-z 12694 df-uz 12966 df-q 13076 df-rp 13121 df-seq 14145 df-exp 14205 df-cj 15266 df-re 15267 df-im 15268 df-sqrt 15402 df-abs 15403 |
| This theorem is used by: numtowerdt 47959 |
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