quadratic variation - meaning and definition. What is quadratic variation
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What (who) is quadratic variation - definition


Quadratic variation         
QUANTITY DEFINED FOR A STOCHASTIC PROCESS; ITS FINITENESS ENSURES THAT STOCHASTIC CALCULUS WORKS PROPERLY
Quadratic covariation; Burkholder-Davis-Gundy inequality; BDG inequality; Bracket process; Quadratic cross-variation; Predictable quadratic variation; Burkholder–Davis–Gundy inequality; Quadratic cross-variance; Burkholder–Davis–Gundy inequalities; Burkholder-Davis-Gundy inequalities
In mathematics, quadratic variation is used in the analysis of stochastic processes such as Brownian motion and other martingales. Quadratic variation is just one kind of variation of a process.
Quadratic irrational number         
MATHEMATICAL CONCEPT
Quadratic surd; Quadratic irrationality; Quadratic Irrational Number; Quadratic irrationalities; Quadratic irrational; Quadratic irrational numbers
In mathematics, a quadratic irrational number (also known as a quadratic irrational, a quadratic irrationality or quadratic surd) is an irrational number that is the solution to some quadratic equation with rational coefficients which is irreducible over the rational numbers.Jörn Steuding, Diophantine Analysis, (2005), Chapman & Hall, p.
Quadratic reciprocity         
THEOREM
Law of quadratic reciprocity; Quadratic reciprocity rule; Aureum Theorema; Law of Quadratic Reciprocity; Quadratic reciprocity law; Quadratic reciprocity theorem; Quadratic Reciprocity; Qr theorem
In number theory, the law of quadratic reciprocity is a theorem about modular arithmetic that gives conditions for the solvability of quadratic equations modulo prime numbers. Due to its subtlety, it has many formulations, but the most standard statement is: