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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 16345 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 12640 | . . . 4 ⊢ ℕ ⊆ ℤ | |
| 2 | 0z 12629 | . . . . 5 ⊢ 0 ∈ ℤ | |
| 3 | 0nnn 12299 | . . . . 5 ⊢ ¬ 0 ∈ ℕ | |
| 4 | 2, 3 | pm3.2i 476 | . . . 4 ⊢ (0 ∈ ℤ ∧ ¬ 0 ∈ ℕ) |
| 5 | ssnelpss 4066 | . . . 4 ⊢ (ℕ ⊆ ℤ → ((0 ∈ ℤ ∧ ¬ 0 ∈ ℕ) → ℕ ⊊ ℤ)) | |
| 6 | 1, 4, 5 | mp2 9 | . . 3 ⊢ ℕ ⊊ ℤ |
| 7 | zssq 13008 | . . . 4 ⊢ ℤ ⊆ ℚ | |
| 8 | 1z 12651 | . . . . . 6 ⊢ 1 ∈ ℤ | |
| 9 | 2nn 12341 | . . . . . 6 ⊢ 2 ∈ ℕ | |
| 10 | znq 13004 | . . . . . 6 ⊢ ((1 ∈ ℤ ∧ 2 ∈ ℕ) → (1 / 2) ∈ ℚ) | |
| 11 | 8, 9, 10 | mp2an 705 | . . . . 5 ⊢ (1 / 2) ∈ ℚ |
| 12 | halfnz 12702 | . . . . 5 ⊢ ¬ (1 / 2) ∈ ℤ | |
| 13 | 11, 12 | pm3.2i 476 | . . . 4 ⊢ ((1 / 2) ∈ ℚ ∧ ¬ (1 / 2) ∈ ℤ) |
| 14 | ssnelpss 4066 | . . . 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 13011 | . . . 4 ⊢ ℚ ⊆ ℝ | |
| 18 | sqrt2re 16342 | . . . . 5 ⊢ (√‘2) ∈ ℝ | |
| 19 | sqrt2irr 16341 | . . . . . 6 ⊢ (√‘2) ∉ ℚ | |
| 20 | 19 | neli 3065 | . . . . 5 ⊢ ¬ (√‘2) ∈ ℚ |
| 21 | 18, 20 | pm3.2i 476 | . . . 4 ⊢ ((√‘2) ∈ ℝ ∧ ¬ (√‘2) ∈ ℚ) |
| 22 | ssnelpss 4066 | . . . 4 ⊢ (ℚ ⊆ ℝ → (((√‘2) ∈ ℝ ∧ ¬ (√‘2) ∈ ℚ) → ℚ ⊊ ℝ)) | |
| 23 | 17, 21, 22 | mp2 9 | . . 3 ⊢ ℚ ⊊ ℝ |
| 24 | ax-resscn 11184 | . . . 4 ⊢ ℝ ⊆ ℂ | |
| 25 | ax-icn 11186 | . . . . 5 ⊢ i ∈ ℂ | |
| 26 | inelr 12235 | . . . . 5 ⊢ ¬ i ∈ ℝ | |
| 27 | 25, 26 | pm3.2i 476 | . . . 4 ⊢ (i ∈ ℂ ∧ ¬ i ∈ ℝ) |
| 28 | ssnelpss 4066 | . . . 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 2145 ⊆ wss 3902 ⊊ wpss 3903 ‘cfv 6537 (class class class)co 7416 ℂcc 11125 ℝcr 11126 0cc0 11127 1c1 11128 ici 11129 / cdiv 11898 ℕcn 12260 2c2 12322 ℤcz 12618 ℚcq 13000 √csqrt 15322 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7739 ax-cnex 11183 ax-resscn 11184 ax-1cn 11185 ax-icn 11186 ax-addcl 11187 ax-addrcl 11188 ax-mulcl 11189 ax-mulrcl 11190 ax-mulcom 11191 ax-addass 11192 ax-mulass 11193 ax-distr 11194 ax-i2m1 11195 ax-1ne0 11196 ax-1rid 11197 ax-rnegex 11198 ax-rrecex 11199 ax-cnre 11200 ax-pre-lttri 11201 ax-pre-lttrn 11202 ax-pre-ltadd 11203 ax-pre-mulgt0 11204 ax-pre-sup 11205 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3064 df-ral 3079 df-rex 3089 df-rmo 3367 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-iun 4956 df-br 5108 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-we 5614 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7373 df-ov 7419 df-oprab 7420 df-mpo 7421 df-om 7866 df-1st 7989 df-2nd 7990 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-rdg 8402 df-er 8699 df-en 8956 df-dom 8957 df-sdom 8958 df-sup 9415 df-pnf 11272 df-mnf 11273 df-xr 11274 df-ltxr 11275 df-le 11276 df-sub 11470 df-neg 11471 df-div 11899 df-nn 12261 df-2 12330 df-3 12331 df-n0 12532 df-z 12619 df-uz 12891 df-q 13001 df-rp 13045 df-seq 14068 df-exp 14128 df-cj 15188 df-re 15189 df-im 15190 df-sqrt 15324 df-abs 15325 |
| This theorem is used by: numtowerdt 47721 |
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