Trace

The word trace has several meanings:

in linear algebra, the trace of a square matrix A is the sum of its main diagonal elements.
in functional analysis, a trace is a generalization of a trace of a matrix over the orthonormal bases of a Hilbert space. See trace class.
in deconstruction, a trace is the self-effacing signified that a sign differs/defers from.
in computer chess, Trace is a chess engine.

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