1949-. Taiwanese-American mathematician, professor at UC San Diego.
Proved that the heat kernel of a graph is equivalent to a generalized PageRank (2007), unifying spectral graph theory and random walk analysis.
Authored the foundational monograph on spectral graph theory, connecting eigenvalues of the graph Laplacian to combinatorial properties: expansion, diameter, mixing time, and connectivity.
Her heat kernel PageRank provides a multi-scale view: the temperature parameter $\tau$ controls the resolution from local neighborhoods to global structure.
This is a direct theoretical ancestor of the cyber tri-kernel: the heat kernel $H_\tau = \exp(-\tau L)$ is one of three kernels computing focus over the cybergraph.
Contributed over 300 papers spanning combinatorics, graph theory, and number theory.