Everett C. Dade *60

Everett died April 8, 2026, in Media, Pa., at the age of 88.

Born Oct. 5, 1937, in Dover, N.H., Everett graduated from Harvard in 1958 and earned a Ph.D. in mathematics from Princeton in 1960. Under the direction of O. Timothy O’Meara, Everett wrote a dissertation entitled “Multiplicity and Monoidal Transformations.”

Everett spent his career as a professor of mathematics at the University of Illinois at Urbana-Champaign. His work focused on finite groups and representation theory, and he introduced the Dade isometry and Dade’s conjecture.

The Dade isometry is an isometry from class functions on a subgroup H with support on a subset K of H to class functions on a Group G. It was introduced as a generalization and simplification of an isometry used by Feit and Thompson in their proof of the odd order theorem. Dade’s conjecture relates the numbers of characters of blocks of a finite group to the numbers of characters of blocks of local subgroups.

Everett is survived by his wife, Catherine Doleans-Dade; and daughter Julia.

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