// Nested quantifier tests verifying no stack overflow and correct semantics. // XPath examples: // 1. some $x in (1,2) satisfies every $y in (1,2) satisfies $x <= $y ...

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#check ∀ x y ε : ℝ, 0 < ε → ε ≤ 1 → |x| < ε → |y| < ε → |x * y| < ε theorem my_lemma : ∀ x y ε : ℝ, 0 < ε → ε ≤ 1 → |x| < ε → |y ...