Talcott Parsons

If there are four equations and only three variables, and no one of the equations is derivable from the others by algebraic manipulation then there is another variable missing.
If there are four equations and only three variables, and no one of the equations is derivable from the others by algebraic manipulation then there is another variable missing.
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These are some quotes by American author Talcott Parsons Sociologist, who lived between December 13, 1902 and May 8, 1979.