We show that the spectrum of a triangular regular limit algebra (TAF algebra) is an invariant for algebraic isomorphism. Combining this with previous results provides a striking rigidity property: two ...

PORTLAND, Ore., Nov. 18, 2025 /PRNewswire/ -- NWEA, a K-12 assessment and research organization, released today a new research brief, "Unequal Access to 8th-Grade Algebra: How School Offerings and ...