Infinity symbol symbol is encoded in Unicode at and in LaTeX as codice_1: formula_4. The Unicode set of symbols also includes several variant forms of the infinity symbol, that are less frequently available in fonts: , and in block Miscellaneous Mathematical Symbols-B. The acid-free paper symbol mentioned above is encoded separately as . Infinity symbol The infinity symbol (sometimes called the lemniscate) is a mathematical symbol representing the concept of infinity. The shape of a sideways figure eight has a long pedigree; for instance, it appears in the cross of Saint Boniface, wrapped around the bars of a Latin cross. However, John
Kronecker symbol Kronecker symbol In number theory, the Kronecker symbol, written as formula_1 or formula_2, is a generalization of the Jacobi symbol to all integers formula_3. It was introduced by . Let formula_3 be a non-zero integer, with prime factorization where formula_6 is a unit (i.e., formula_7), and the formula_8 are primes. Let formula_9 be an integer. The Kronecker symbol formula_10 is defined by For odd formula_8, the number formula_13 is simply the usual Legendre symbol. This leaves the case when formula_14. We define formula_15 by Since it extends the Jacobi symbol, the quantity formula_17 is simply formula_18 when formula_19. When formula_20,