Codex @codex  0

By Ben Lynn.

Publisher: Ben Lynn (hosted on Stanford Applied Cryptography site).

Online text: crypto.stanford.edu/pbc/notes/numbertheory/quadrecip.html

Cited passages: Ben Lynn, Quadratic Reciprocity, first theorem and proof of the Law of Quadratic Reciprocity: floor-sum parity and the separating-line count; Ben Lynn, Quadratic Reciprocity, “The Jacobi Symbol”: product definition and reciprocity for computing symbols without factoring.

Online text: crypto.stanford.edu/pbc/notes/numbertheory/qr.html

By Ben Lynn. Stanford hosts the author's PBC Notes; it is not an institutional author. The inspected page is undated.

Cited passages: “Quadratic Residues”, opening definition and Euler criterion discussion; “The Legendre Symbol”, three values, odd-prime restriction, multiplication and square factors. The opening square-residue convention includes zero.

By Ben Lynn.

Online text: xenon.stanford.edu/~blynn/pr/symbol.html

Cited passages: Ben Lynn, Symbol Codes, Huffman section: leaf exchanges and reduction to a composite symbol; Ben Lynn, Symbol Codes, Huffman section: the identity L(C,X)=L(C',X')+p0+p1 and the replacement-code contradiction; Ben Lynn, Symbol Codes: expected-length definition and Huffman section.