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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 16180 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 12511 | . . . 4 ⊢ ℕ ⊆ ℤ | |
| 2 | 0z 12500 | . . . . 5 ⊢ 0 ∈ ℤ | |
| 3 | 0nnn 12182 | . . . . 5 ⊢ ¬ 0 ∈ ℕ | |
| 4 | 2, 3 | pm3.2i 470 | . . . 4 ⊢ (0 ∈ ℤ ∧ ¬ 0 ∈ ℕ) |
| 5 | ssnelpss 4067 | . . . 4 ⊢ (ℕ ⊆ ℤ → ((0 ∈ ℤ ∧ ¬ 0 ∈ ℕ) → ℕ ⊊ ℤ)) | |
| 6 | 1, 4, 5 | mp2 9 | . . 3 ⊢ ℕ ⊊ ℤ |
| 7 | zssq 12875 | . . . 4 ⊢ ℤ ⊆ ℚ | |
| 8 | 1z 12523 | . . . . . 6 ⊢ 1 ∈ ℤ | |
| 9 | 2nn 12219 | . . . . . 6 ⊢ 2 ∈ ℕ | |
| 10 | znq 12871 | . . . . . 6 ⊢ ((1 ∈ ℤ ∧ 2 ∈ ℕ) → (1 / 2) ∈ ℚ) | |
| 11 | 8, 9, 10 | mp2an 692 | . . . . 5 ⊢ (1 / 2) ∈ ℚ |
| 12 | halfnz 12572 | . . . . 5 ⊢ ¬ (1 / 2) ∈ ℤ | |
| 13 | 11, 12 | pm3.2i 470 | . . . 4 ⊢ ((1 / 2) ∈ ℚ ∧ ¬ (1 / 2) ∈ ℤ) |
| 14 | ssnelpss 4067 | . . . 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 470 | . 2 ⊢ (ℕ ⊊ ℤ ∧ ℤ ⊊ ℚ) |
| 17 | qssre 12878 | . . . 4 ⊢ ℚ ⊆ ℝ | |
| 18 | sqrt2re 16177 | . . . . 5 ⊢ (√‘2) ∈ ℝ | |
| 19 | sqrt2irr 16176 | . . . . . 6 ⊢ (√‘2) ∉ ℚ | |
| 20 | 19 | neli 3031 | . . . . 5 ⊢ ¬ (√‘2) ∈ ℚ |
| 21 | 18, 20 | pm3.2i 470 | . . . 4 ⊢ ((√‘2) ∈ ℝ ∧ ¬ (√‘2) ∈ ℚ) |
| 22 | ssnelpss 4067 | . . . 4 ⊢ (ℚ ⊆ ℝ → (((√‘2) ∈ ℝ ∧ ¬ (√‘2) ∈ ℚ) → ℚ ⊊ ℝ)) | |
| 23 | 17, 21, 22 | mp2 9 | . . 3 ⊢ ℚ ⊊ ℝ |
| 24 | ax-resscn 11085 | . . . 4 ⊢ ℝ ⊆ ℂ | |
| 25 | ax-icn 11087 | . . . . 5 ⊢ i ∈ ℂ | |
| 26 | inelr 12136 | . . . . 5 ⊢ ¬ i ∈ ℝ | |
| 27 | 25, 26 | pm3.2i 470 | . . . 4 ⊢ (i ∈ ℂ ∧ ¬ i ∈ ℝ) |
| 28 | ssnelpss 4067 | . . . 4 ⊢ (ℝ ⊆ ℂ → ((i ∈ ℂ ∧ ¬ i ∈ ℝ) → ℝ ⊊ ℂ)) | |
| 29 | 24, 27, 28 | mp2 9 | . . 3 ⊢ ℝ ⊊ ℂ |
| 30 | 23, 29 | pm3.2i 470 | . 2 ⊢ (ℚ ⊊ ℝ ∧ ℝ ⊊ ℂ) |
| 31 | 16, 30 | pm3.2i 470 | 1 ⊢ ((ℕ ⊊ ℤ ∧ ℤ ⊊ ℚ) ∧ (ℚ ⊊ ℝ ∧ ℝ ⊊ ℂ)) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ∧ wa 395 ∈ wcel 2109 ⊆ wss 3905 ⊊ wpss 3906 ‘cfv 6486 (class class class)co 7353 ℂcc 11026 ℝcr 11027 0cc0 11028 1c1 11029 ici 11030 / cdiv 11795 ℕcn 12146 2c2 12201 ℤcz 12489 ℚcq 12867 √csqrt 15158 |
| 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 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5238 ax-nul 5248 ax-pow 5307 ax-pr 5374 ax-un 7675 ax-cnex 11084 ax-resscn 11085 ax-1cn 11086 ax-icn 11087 ax-addcl 11088 ax-addrcl 11089 ax-mulcl 11090 ax-mulrcl 11091 ax-mulcom 11092 ax-addass 11093 ax-mulass 11094 ax-distr 11095 ax-i2m1 11096 ax-1ne0 11097 ax-1rid 11098 ax-rnegex 11099 ax-rrecex 11100 ax-cnre 11101 ax-pre-lttri 11102 ax-pre-lttrn 11103 ax-pre-ltadd 11104 ax-pre-mulgt0 11105 ax-pre-sup 11106 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rmo 3345 df-reu 3346 df-rab 3397 df-v 3440 df-sbc 3745 df-csb 3854 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-pss 3925 df-nul 4287 df-if 4479 df-pw 4555 df-sn 4580 df-pr 4582 df-op 4586 df-uni 4862 df-iun 4946 df-br 5096 df-opab 5158 df-mpt 5177 df-tr 5203 df-id 5518 df-eprel 5523 df-po 5531 df-so 5532 df-fr 5576 df-we 5578 df-xp 5629 df-rel 5630 df-cnv 5631 df-co 5632 df-dm 5633 df-rn 5634 df-res 5635 df-ima 5636 df-pred 6253 df-ord 6314 df-on 6315 df-lim 6316 df-suc 6317 df-iota 6442 df-fun 6488 df-fn 6489 df-f 6490 df-f1 6491 df-fo 6492 df-f1o 6493 df-fv 6494 df-riota 7310 df-ov 7356 df-oprab 7357 df-mpo 7358 df-om 7807 df-1st 7931 df-2nd 7932 df-frecs 8221 df-wrecs 8252 df-recs 8301 df-rdg 8339 df-er 8632 df-en 8880 df-dom 8881 df-sdom 8882 df-sup 9351 df-pnf 11170 df-mnf 11171 df-xr 11172 df-ltxr 11173 df-le 11174 df-sub 11367 df-neg 11368 df-div 11796 df-nn 12147 df-2 12209 df-3 12210 df-n0 12403 df-z 12490 df-uz 12754 df-q 12868 df-rp 12912 df-seq 13927 df-exp 13987 df-cj 15024 df-re 15025 df-im 15026 df-sqrt 15160 df-abs 15161 |
| This theorem is referenced by: (None) |
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