Theorem modfsummodslem1 15149

Description: Lemma 1 for modfsummods 15150. (Contributed by Alexander van der Vekens, 1-Sep-2018.)

Assertion

Ref	Expression
modfsummodslem1	⊢ (∀𝑘 ∈ (𝐴 ∪ {𝑧})𝐵 ∈ ℤ → ⦋𝑧 / 𝑘⦌𝐵 ∈ ℤ)

Distinct variable groups:   𝐴,𝑘   𝑧,𝑘

Allowed substitution hints:   𝐴(𝑧)   𝐵(𝑧,𝑘)

Proof of Theorem modfsummodslem1

Step	Hyp	Ref	Expression
1		vsnid 4604	. . 3 ⊢ 𝑧 ∈ {𝑧}
2		elun2 4155	. . 3 ⊢ (𝑧 ∈ {𝑧} → 𝑧 ∈ (𝐴 ∪ {𝑧}))
3	1, 2	ax-mp 5	. 2 ⊢ 𝑧 ∈ (𝐴 ∪ {𝑧})
4		rspcsbela 4389	. 2 ⊢ ((𝑧 ∈ (𝐴 ∪ {𝑧}) ∧ ∀𝑘 ∈ (𝐴 ∪ {𝑧})𝐵 ∈ ℤ) → ⦋𝑧 / 𝑘⦌𝐵 ∈ ℤ)
5	3, 4	mpan 688	1 ⊢ (∀𝑘 ∈ (𝐴 ∪ {𝑧})𝐵 ∈ ℤ → ⦋𝑧 / 𝑘⦌𝐵 ∈ ℤ)

Syntax hints:   → wi 4   ∈ wcel 2114  ∀wral 3140  ⦋csb 3885   ∪ cun 3936  {csn 4569  ℤcz 11984

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2795

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-tru 1540  df-fal 1550  df-ex 1781  df-nf 1785  df-sb 2070  df-clab 2802  df-cleq 2816  df-clel 2895  df-nfc 2965  df-ral 3145  df-v 3498  df-sbc 3775  df-csb 3886  df-dif 3941  df-un 3943  df-in 3945  df-ss 3954  df-nul 4294  df-sn 4570

This theorem is referenced by:  modfsummods  15150