J

J

J : A unit vector on the positive y-axis of co-ordinate system .

Job: A unit of work for a computer , generally comprising an application program or group of releated programs and the data, linkages, and instructions to be operating system needed for running the program.

  

join

A binary operation whose value on two elements a and b of a lattice is the least upper bound of a and b, denoted a  b.

join prime

An element a of a lattice is called join prime if whenever a  b  c then a  b or a  c. Also, a is called strictly join prime if

joint probability function

A function that gives the probability that each of two or more random variables takes at a particular value.

joint variation

A variation in which the values of one variable depend upon those of 2 or more variables.

Jordan curve

Any continuous  simply  closed curve in the plane, that is , it is simple and closed.

Jordan matrix

A matrix whose diagonal elements are all equal (and nonzero) and whose elements above the principal diagonal are equal to 1, but all other elements are 0.

jump discontinuity

A discontinuity for which the graph steps or jumps from one connected piece of the graph to another. Formally, it is a discontinuity for which the limits from the left and right both exist but are not equal to each other.

Joule : The SI unit of work or energy, defined to be the work done by force of 1 Newton acting to move an object  through a distance of 1 meter in the direction in which the force is applied. The Joule is named after the British Physicist James Prescott Joule (1818 – 1889 ) , who demonstrated the equivalence of mechanical and thermal energy in a famous experiment in 1843.