In number theory, the Kronecker symbol, written as or (a|n), is a generalization of the Jacobi symbol to all integers n. It was introduced by Leopold Kronecker.
Read more about Kronecker Symbol: Definition, Properties, Connection To Dirichlet Characters
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“The symbol of perpetual youth, the grass-blade, like a long green ribbon, streams from the sod into the summer, checked indeed by the frost, but anon pushing on again, lifting its spear of last year’s hay with the fresh life below. It grows as steadily as the rill oozes out of the ground.... So our human life but dies down to its root, and still puts forth its green blade to eternity.”
—Henry David Thoreau (1817–1862)