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Constants and variables

Applying mathematics in studying of laws of nature and using them in technique, we meet with constants and variables. A variable is a value, which can be changed at the conditions of the considered problem; a constant cannot be changed at these conditions. The same value can be a constant for one problem and a variable for the other.

E x a m p l e .  An acceleration of a gravity is a constant  for the same  width of Earth, but it
                       changes depending on a width, i.e. in other words is a variable.

Variables are marked usually by the last letters of the Latin alphabet:  x,  y,  z, and constants by the first ones:  a,  b,  c, .


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