Positive definiteness


  • Fasshauer, Gregory E. (2011), "Positive definite kernels: Past, present and future" (PDF), Dolomites Research Notes on Approximation, 4: 21–63.
  • Stewart, James (1976), "Positive definite functions and generalizations, an historical survey", The Rocky Mountain Journal of Mathematics, 6 (3): 409–434, doi:10.1216/RMJ-1976-6-3-409, MR 0430674.
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