Positive-definite Kernel
In operator theory, a branch of mathematics, a positive definite kernel is a generalization of a positive-definite matrix.
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“We should never stand upon ceremony with sincerity. We should never cheat and insult and banish one another by our meanness, if there were present the kernel of worth and friendliness. We should not meet thus in haste.”
—Henry David Thoreau (1817–1862)