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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 16228 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 12558 | . . . 4 ⊢ ℕ ⊆ ℤ | |
| 2 | 0z 12547 | . . . . 5 ⊢ 0 ∈ ℤ | |
| 3 | 0nnn 12229 | . . . . 5 ⊢ ¬ 0 ∈ ℕ | |
| 4 | 2, 3 | pm3.2i 470 | . . . 4 ⊢ (0 ∈ ℤ ∧ ¬ 0 ∈ ℕ) |
| 5 | ssnelpss 4080 | . . . 4 ⊢ (ℕ ⊆ ℤ → ((0 ∈ ℤ ∧ ¬ 0 ∈ ℕ) → ℕ ⊊ ℤ)) | |
| 6 | 1, 4, 5 | mp2 9 | . . 3 ⊢ ℕ ⊊ ℤ |
| 7 | zssq 12922 | . . . 4 ⊢ ℤ ⊆ ℚ | |
| 8 | 1z 12570 | . . . . . 6 ⊢ 1 ∈ ℤ | |
| 9 | 2nn 12266 | . . . . . 6 ⊢ 2 ∈ ℕ | |
| 10 | znq 12918 | . . . . . 6 ⊢ ((1 ∈ ℤ ∧ 2 ∈ ℕ) → (1 / 2) ∈ ℚ) | |
| 11 | 8, 9, 10 | mp2an 692 | . . . . 5 ⊢ (1 / 2) ∈ ℚ |
| 12 | halfnz 12619 | . . . . 5 ⊢ ¬ (1 / 2) ∈ ℤ | |
| 13 | 11, 12 | pm3.2i 470 | . . . 4 ⊢ ((1 / 2) ∈ ℚ ∧ ¬ (1 / 2) ∈ ℤ) |
| 14 | ssnelpss 4080 | . . . 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 12925 | . . . 4 ⊢ ℚ ⊆ ℝ | |
| 18 | sqrt2re 16225 | . . . . 5 ⊢ (√‘2) ∈ ℝ | |
| 19 | sqrt2irr 16224 | . . . . . 6 ⊢ (√‘2) ∉ ℚ | |
| 20 | 19 | neli 3032 | . . . . 5 ⊢ ¬ (√‘2) ∈ ℚ |
| 21 | 18, 20 | pm3.2i 470 | . . . 4 ⊢ ((√‘2) ∈ ℝ ∧ ¬ (√‘2) ∈ ℚ) |
| 22 | ssnelpss 4080 | . . . 4 ⊢ (ℚ ⊆ ℝ → (((√‘2) ∈ ℝ ∧ ¬ (√‘2) ∈ ℚ) → ℚ ⊊ ℝ)) | |
| 23 | 17, 21, 22 | mp2 9 | . . 3 ⊢ ℚ ⊊ ℝ |
| 24 | ax-resscn 11132 | . . . 4 ⊢ ℝ ⊆ ℂ | |
| 25 | ax-icn 11134 | . . . . 5 ⊢ i ∈ ℂ | |
| 26 | inelr 12183 | . . . . 5 ⊢ ¬ i ∈ ℝ | |
| 27 | 25, 26 | pm3.2i 470 | . . . 4 ⊢ (i ∈ ℂ ∧ ¬ i ∈ ℝ) |
| 28 | ssnelpss 4080 | . . . 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 3917 ⊊ wpss 3918 ‘cfv 6514 (class class class)co 7390 ℂcc 11073 ℝcr 11074 0cc0 11075 1c1 11076 ici 11077 / cdiv 11842 ℕcn 12193 2c2 12248 ℤcz 12536 ℚcq 12914 √csqrt 15206 |
| 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 2702 ax-sep 5254 ax-nul 5264 ax-pow 5323 ax-pr 5390 ax-un 7714 ax-cnex 11131 ax-resscn 11132 ax-1cn 11133 ax-icn 11134 ax-addcl 11135 ax-addrcl 11136 ax-mulcl 11137 ax-mulrcl 11138 ax-mulcom 11139 ax-addass 11140 ax-mulass 11141 ax-distr 11142 ax-i2m1 11143 ax-1ne0 11144 ax-1rid 11145 ax-rnegex 11146 ax-rrecex 11147 ax-cnre 11148 ax-pre-lttri 11149 ax-pre-lttrn 11150 ax-pre-ltadd 11151 ax-pre-mulgt0 11152 ax-pre-sup 11153 |
| 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 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ne 2927 df-nel 3031 df-ral 3046 df-rex 3055 df-rmo 3356 df-reu 3357 df-rab 3409 df-v 3452 df-sbc 3757 df-csb 3866 df-dif 3920 df-un 3922 df-in 3924 df-ss 3934 df-pss 3937 df-nul 4300 df-if 4492 df-pw 4568 df-sn 4593 df-pr 4595 df-op 4599 df-uni 4875 df-iun 4960 df-br 5111 df-opab 5173 df-mpt 5192 df-tr 5218 df-id 5536 df-eprel 5541 df-po 5549 df-so 5550 df-fr 5594 df-we 5596 df-xp 5647 df-rel 5648 df-cnv 5649 df-co 5650 df-dm 5651 df-rn 5652 df-res 5653 df-ima 5654 df-pred 6277 df-ord 6338 df-on 6339 df-lim 6340 df-suc 6341 df-iota 6467 df-fun 6516 df-fn 6517 df-f 6518 df-f1 6519 df-fo 6520 df-f1o 6521 df-fv 6522 df-riota 7347 df-ov 7393 df-oprab 7394 df-mpo 7395 df-om 7846 df-1st 7971 df-2nd 7972 df-frecs 8263 df-wrecs 8294 df-recs 8343 df-rdg 8381 df-er 8674 df-en 8922 df-dom 8923 df-sdom 8924 df-sup 9400 df-pnf 11217 df-mnf 11218 df-xr 11219 df-ltxr 11220 df-le 11221 df-sub 11414 df-neg 11415 df-div 11843 df-nn 12194 df-2 12256 df-3 12257 df-n0 12450 df-z 12537 df-uz 12801 df-q 12915 df-rp 12959 df-seq 13974 df-exp 14034 df-cj 15072 df-re 15073 df-im 15074 df-sqrt 15208 df-abs 15209 |
| This theorem is referenced by: (None) |
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