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Mirrors > Home > ILE Home > Th. List > nn0ge2m1nn0 | GIF version |
Description: If a nonnegative integer is greater than or equal to two, the integer decreased by 1 is also a nonnegative integer. (Contributed by Alexander van der Vekens, 1-Aug-2018.) |
Ref | Expression |
---|---|
nn0ge2m1nn0 | ⊢ ((𝑁 ∈ ℕ0 ∧ 2 ≤ 𝑁) → (𝑁 − 1) ∈ ℕ0) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nn0ge2m1nn 9199 | . 2 ⊢ ((𝑁 ∈ ℕ0 ∧ 2 ≤ 𝑁) → (𝑁 − 1) ∈ ℕ) | |
2 | 1 | nnnn0d 9192 | 1 ⊢ ((𝑁 ∈ ℕ0 ∧ 2 ≤ 𝑁) → (𝑁 − 1) ∈ ℕ0) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ∈ wcel 2142 class class class wbr 3990 (class class class)co 5857 1c1 7779 ≤ cle 7959 − cmin 8094 2c2 8933 ℕ0cn0 9139 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 610 ax-in2 611 ax-io 705 ax-5 1441 ax-7 1442 ax-gen 1443 ax-ie1 1487 ax-ie2 1488 ax-8 1498 ax-10 1499 ax-11 1500 ax-i12 1501 ax-bndl 1503 ax-4 1504 ax-17 1520 ax-i9 1524 ax-ial 1528 ax-i5r 1529 ax-13 2144 ax-14 2145 ax-ext 2153 ax-sep 4108 ax-pow 4161 ax-pr 4195 ax-un 4419 ax-setind 4522 ax-cnex 7869 ax-resscn 7870 ax-1cn 7871 ax-1re 7872 ax-icn 7873 ax-addcl 7874 ax-addrcl 7875 ax-mulcl 7876 ax-addcom 7878 ax-addass 7880 ax-distr 7882 ax-i2m1 7883 ax-0lt1 7884 ax-0id 7886 ax-rnegex 7887 ax-cnre 7889 ax-pre-ltirr 7890 ax-pre-ltwlin 7891 ax-pre-lttrn 7892 ax-pre-ltadd 7894 |
This theorem depends on definitions: df-bi 116 df-3an 976 df-tru 1352 df-fal 1355 df-nf 1455 df-sb 1757 df-eu 2023 df-mo 2024 df-clab 2158 df-cleq 2164 df-clel 2167 df-nfc 2302 df-ne 2342 df-nel 2437 df-ral 2454 df-rex 2455 df-reu 2456 df-rab 2458 df-v 2733 df-sbc 2957 df-dif 3124 df-un 3126 df-in 3128 df-ss 3135 df-pw 3569 df-sn 3590 df-pr 3591 df-op 3593 df-uni 3798 df-int 3833 df-br 3991 df-opab 4052 df-id 4279 df-xp 4618 df-rel 4619 df-cnv 4620 df-co 4621 df-dm 4622 df-iota 5162 df-fun 5202 df-fv 5208 df-riota 5813 df-ov 5860 df-oprab 5861 df-mpo 5862 df-pnf 7960 df-mnf 7961 df-xr 7962 df-ltxr 7963 df-le 7964 df-sub 8096 df-inn 8883 df-2 8941 df-n0 9140 |
This theorem is referenced by: (None) |
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