a method of solving huge sparse systems
of linear equations
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An engineer might come into a situtation in which he has some large number N (e.g. more than 200) of unknowns and has at least N linear equations relating those to each other.
He can program this Orthodrop Method himself on his private computer and solve the system.
I invented the method, only to learn that John von Neumann had invented it about 50 years ealier. I still wonder why it did not get into textbooks. Perhaps the speed-up step I invented for it makes it more practical?