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Mathbox for Alexander van der Vekens |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > fpprbasnn | Structured version Visualization version GIF version |
Description: The base of a Fermat pseudoprime is a positive integer. (Contributed by AV, 30-May-2023.) |
Ref | Expression |
---|---|
fpprbasnn | ⊢ (𝑋 ∈ ( FPPr ‘𝑁) → 𝑁 ∈ ℕ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax-1 6 | . 2 ⊢ (𝑁 ∈ ℕ → (𝑋 ∈ ( FPPr ‘𝑁) → 𝑁 ∈ ℕ)) | |
2 | df-fppr 46472 | . . . 4 ⊢ FPPr = (𝑛 ∈ ℕ ↦ {𝑥 ∈ (ℤ≥‘4) ∣ (𝑥 ∉ ℙ ∧ 𝑥 ∥ ((𝑛↑(𝑥 − 1)) − 1))}) | |
3 | 2 | fvmptndm 7028 | . . 3 ⊢ (¬ 𝑁 ∈ ℕ → ( FPPr ‘𝑁) = ∅) |
4 | eleq2 2822 | . . . 4 ⊢ (( FPPr ‘𝑁) = ∅ → (𝑋 ∈ ( FPPr ‘𝑁) ↔ 𝑋 ∈ ∅)) | |
5 | noel 4330 | . . . . 5 ⊢ ¬ 𝑋 ∈ ∅ | |
6 | 5 | pm2.21i 119 | . . . 4 ⊢ (𝑋 ∈ ∅ → 𝑁 ∈ ℕ) |
7 | 4, 6 | syl6bi 252 | . . 3 ⊢ (( FPPr ‘𝑁) = ∅ → (𝑋 ∈ ( FPPr ‘𝑁) → 𝑁 ∈ ℕ)) |
8 | 3, 7 | syl 17 | . 2 ⊢ (¬ 𝑁 ∈ ℕ → (𝑋 ∈ ( FPPr ‘𝑁) → 𝑁 ∈ ℕ)) |
9 | 1, 8 | pm2.61i 182 | 1 ⊢ (𝑋 ∈ ( FPPr ‘𝑁) → 𝑁 ∈ ℕ) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∧ wa 396 = wceq 1541 ∈ wcel 2106 ∉ wnel 3046 {crab 3432 ∅c0 4322 class class class wbr 5148 ‘cfv 6543 (class class class)co 7411 1c1 11113 − cmin 11446 ℕcn 12214 4c4 12271 ℤ≥cuz 12824 ↑cexp 14029 ∥ cdvds 16199 ℙcprime 16610 FPPr cfppr 46471 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-sep 5299 ax-nul 5306 ax-pr 5427 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ral 3062 df-rex 3071 df-rab 3433 df-v 3476 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-nul 4323 df-if 4529 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-br 5149 df-opab 5211 df-mpt 5232 df-dm 5686 df-iota 6495 df-fv 6551 df-fppr 46472 |
This theorem is referenced by: fpprnn 46477 fpprwppr 46486 fpprwpprb 46487 |
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