Theorem mpt2difsnif 6651

Description: A mapping with two arguments with the first argument from a difference set with a singleton and a conditional as result. (Contributed by AV, 13-Feb-2019.)

Assertion

Ref	Expression
mpt2difsnif	⊢ (𝑖 ∈ (𝐴 ∖ {𝑋}), 𝑗 ∈ 𝐵 ↦ if(𝑖 = 𝑋, 𝐶, 𝐷)) = (𝑖 ∈ (𝐴 ∖ {𝑋}), 𝑗 ∈ 𝐵 ↦ 𝐷)

Proof of Theorem mpt2difsnif

Step	Hyp	Ref	Expression
1		eldifsn 4260	. . . . 5 ⊢ (𝑖 ∈ (𝐴 ∖ {𝑋}) ↔ (𝑖 ∈ 𝐴 ∧ 𝑖 ≠ 𝑋))
2		df-ne 2782	. . . . . . 7 ⊢ (𝑖 ≠ 𝑋 ↔ ¬ 𝑖 = 𝑋)
3	2	biimpi 205	. . . . . 6 ⊢ (𝑖 ≠ 𝑋 → ¬ 𝑖 = 𝑋)
4	3	adantl 481	. . . . 5 ⊢ ((𝑖 ∈ 𝐴 ∧ 𝑖 ≠ 𝑋) → ¬ 𝑖 = 𝑋)
5	1, 4	sylbi 206	. . . 4 ⊢ (𝑖 ∈ (𝐴 ∖ {𝑋}) → ¬ 𝑖 = 𝑋)
6	5	adantr 480	. . 3 ⊢ ((𝑖 ∈ (𝐴 ∖ {𝑋}) ∧ 𝑗 ∈ 𝐵) → ¬ 𝑖 = 𝑋)
7	6	iffalsed 4047	. 2 ⊢ ((𝑖 ∈ (𝐴 ∖ {𝑋}) ∧ 𝑗 ∈ 𝐵) → if(𝑖 = 𝑋, 𝐶, 𝐷) = 𝐷)
8	7	mpt2eq3ia 6618	1 ⊢ (𝑖 ∈ (𝐴 ∖ {𝑋}), 𝑗 ∈ 𝐵 ↦ if(𝑖 = 𝑋, 𝐶, 𝐷)) = (𝑖 ∈ (𝐴 ∖ {𝑋}), 𝑗 ∈ 𝐵 ↦ 𝐷)

Syntax hints:  ¬ wn 3   ∧ wa 383   = wceq 1475   ∈ wcel 1977   ≠ wne 2780   ∖ cdif 3537  ifcif 4036  {csn 4125   ↦ cmpt2 6551

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-v 3175  df-dif 3543  df-if 4037  df-sn 4126  df-oprab 6553  df-mpt2 6554

This theorem is referenced by:  smadiadetglem1  20296