MATH TERMS THAT START WITH J

Joint Probability :

The chance that two or more events occur together.

Let (X,Y) be a two dimensional discrete random variables.

Let p(x_i, y_j) be real number associated with each (x_i, y_j)

i  =  1,2,3,............

Then p is called the joint probability function of (X, Y) if the following conditions are satisfied.

p (x_i, y_j) ≥ for all i, j = 1,2,3,...........

  ∞      ∞

  Σ       Σ  p(x_i, y_j)  =  1

i = 1   j = 1

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Joint Discontinuity :

If the left and right hand limits exist, but disagree then the graph jump at x  =  a.

J :

'j' is the unit vector in vector study.

Jacobian :

In vector calculus Jacobian matrix is of all first order derivatives of a vector or scalar valued function with respect to another vector.

Joint Variation :

Joint variation is the same as direct variation with two or more quantities. That is if a quantity varies jointly as two or more other quantities, the ratio of the first quantity to the product of other quantities is a constant. That is x/yz  =  k. 

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