¶Intersection of ≤ t₁ and ≠ t₂

The intersection of an upper bound and a non-equivalence cannot be simplified.

(≤ t₁) ∧ (≠ t₂) = (≤ t₁) ∧ (≁ t₂)

(If there is also a lower bound, then the range might be simplifiable!)

Intersection of s₁..t₁ and ≠ t₂

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