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| Mirrors > Home > MPE Home > Th. List > nthruz | Structured version Visualization version GIF version | ||
| Description: The sequence ℕ, ℕ0, and ℤ 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 ℕ0 but not ℕ and minus one belongs to ℤ but not ℕ0. This theorem refines the chain of proper subsets nthruc 16294. (Contributed by NM, 9-May-2004.) |
| Ref | Expression |
|---|---|
| nthruz | ⊢ (ℕ ⊊ ℕ0 ∧ ℕ0 ⊊ ℤ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nnssnn0 12494 | . . 3 ⊢ ℕ ⊆ ℕ0 | |
| 2 | 0nn0 12506 | . . . 4 ⊢ 0 ∈ ℕ0 | |
| 3 | 0nnn 12259 | . . . 4 ⊢ ¬ 0 ∈ ℕ | |
| 4 | 2, 3 | pm3.2i 474 | . . 3 ⊢ (0 ∈ ℕ0 ∧ ¬ 0 ∈ ℕ) |
| 5 | ssnelpss 4069 | . . 3 ⊢ (ℕ ⊆ ℕ0 → ((0 ∈ ℕ0 ∧ ¬ 0 ∈ ℕ) → ℕ ⊊ ℕ0)) | |
| 6 | 1, 4, 5 | mp2 9 | . 2 ⊢ ℕ ⊊ ℕ0 |
| 7 | nn0ssz 12601 | . . 3 ⊢ ℕ0 ⊆ ℤ | |
| 8 | neg1z 12617 | . . . 4 ⊢ -1 ∈ ℤ | |
| 9 | neg1lt0 12193 | . . . . 5 ⊢ -1 < 0 | |
| 10 | nn0nlt0 12517 | . . . . 5 ⊢ (-1 ∈ ℕ0 → ¬ -1 < 0) | |
| 11 | 9, 10 | mt2 202 | . . . 4 ⊢ ¬ -1 ∈ ℕ0 |
| 12 | 8, 11 | pm3.2i 474 | . . 3 ⊢ (-1 ∈ ℤ ∧ ¬ -1 ∈ ℕ0) |
| 13 | ssnelpss 4069 | . . 3 ⊢ (ℕ0 ⊆ ℤ → ((-1 ∈ ℤ ∧ ¬ -1 ∈ ℕ0) → ℕ0 ⊊ ℤ)) | |
| 14 | 7, 12, 13 | mp2 9 | . 2 ⊢ ℕ0 ⊊ ℤ |
| 15 | 6, 14 | pm3.2i 474 | 1 ⊢ (ℕ ⊊ ℕ0 ∧ ℕ0 ⊊ ℤ) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ∧ wa 399 ∈ wcel 2143 ⊆ wss 3905 ⊊ wpss 3906 class class class wbr 5101 0cc0 11084 1c1 11085 < clt 11227 -cneg 11426 ℕcn 12220 ℕ0cn0 12491 ℤcz 12578 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1816 ax-4 1830 ax-5 1931 ax-6 1988 ax-7 2029 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-sep 5247 ax-nul 5257 ax-pow 5323 ax-pr 5391 ax-un 7718 ax-resscn 11141 ax-1cn 11142 ax-icn 11143 ax-addcl 11144 ax-addrcl 11145 ax-mulcl 11146 ax-mulrcl 11147 ax-mulcom 11148 ax-addass 11149 ax-mulass 11150 ax-distr 11151 ax-i2m1 11152 ax-1ne0 11153 ax-1rid 11154 ax-rnegex 11155 ax-rrecex 11156 ax-cnre 11157 ax-pre-lttri 11158 ax-pre-lttrn 11159 ax-pre-ltadd 11160 ax-pre-mulgt0 11161 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1100 df-3an 1101 df-tru 1564 df-fal 1574 df-ex 1801 df-nf 1805 df-sb 2092 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-nel 3063 df-ral 3078 df-rex 3088 df-reu 3369 df-rab 3416 df-v 3457 df-sbc 3746 df-csb 3854 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-pss 3925 df-nul 4287 df-if 4482 df-pw 4558 df-sn 4584 df-pr 4586 df-op 4590 df-uni 4867 df-iun 4952 df-br 5102 df-opab 5164 df-mpt 5183 df-tr 5209 df-id 5543 df-eprel 5548 df-po 5556 df-so 5557 df-fr 5601 df-we 5603 df-xp 5654 df-rel 5655 df-cnv 5656 df-co 5657 df-dm 5658 df-rn 5659 df-res 5660 df-ima 5661 df-pred 6288 df-ord 6349 df-on 6350 df-lim 6351 df-suc 6352 df-iota 6477 df-fun 6523 df-fn 6524 df-f 6525 df-f1 6526 df-fo 6527 df-f1o 6528 df-fv 6529 df-riota 7353 df-ov 7399 df-oprab 7400 df-mpo 7401 df-om 7847 df-2nd 7971 df-frecs 8262 df-wrecs 8293 df-recs 8342 df-rdg 8381 df-er 8678 df-en 8928 df-dom 8929 df-sdom 8930 df-pnf 11229 df-mnf 11230 df-xr 11231 df-ltxr 11232 df-le 11233 df-sub 11427 df-neg 11428 df-nn 12221 df-n0 12492 df-z 12579 |
| This theorem is referenced by: nthrucw 47453 |
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