Theorem bj-cleljusti 34015

Description: One direction of cleljust 2123, requiring only ax-1 6-- ax-5 1911 and ax8v1 2118. (Contributed by BJ, 31-Dec-2020.) (Proof modification is discouraged.)

Assertion

Ref	Expression
bj-cleljusti	⊢ (∃𝑧(𝑧 = 𝑥 ∧ 𝑧 ∈ 𝑦) → 𝑥 ∈ 𝑦)

Distinct variable groups:   𝑥,𝑧   𝑦,𝑧

Proof of Theorem bj-cleljusti

Step	Hyp	Ref	Expression
1		ax8v1 2118	. . 3 ⊢ (𝑧 = 𝑥 → (𝑧 ∈ 𝑦 → 𝑥 ∈ 𝑦))
2	1	imp 409	. 2 ⊢ ((𝑧 = 𝑥 ∧ 𝑧 ∈ 𝑦) → 𝑥 ∈ 𝑦)
3	2	exlimiv 1931	1 ⊢ (∃𝑧(𝑧 = 𝑥 ∧ 𝑧 ∈ 𝑦) → 𝑥 ∈ 𝑦)

Syntax hints:   → wi 4   ∧ wa 398  ∃wex 1780

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-8 2116

This theorem depends on definitions:  df-bi 209  df-an 399  df-ex 1781

This theorem is referenced by: (None)