n: inputs
n ( n - 1 ) / 2
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Represent each row (or column) of the matrix by a point in the network. The entry in the ith row and jth column of the matrix represents the weight (distance?) between points I and J. If Mij = 0 then you cannot get from I to J. If Mij = Mji then a single two-way link between points I and J is required. If Mij ≠Mji then two one-way links between points I and J are required.
A line segment is between two end points
Do you mean "Between two other points? If yes, when it lies on a straight line between both points that are farther away and on the same line.
the distance between two points is length
The distance between identical points on a wave is called wavelength.