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  • (cur | prev) 12:00, 18 September 2008โ€Ž Sparksj (Talk)โ€Ž . . (117 bytes) (+117)โ€Ž . . (New page: A system is causal if the output at any time depends only on values of the input at the present time and in the past.)

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Basic linear algebra uncovers and clarifies very important geometry and algebra.

Dr. Paul Garrett