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Eigenvalues and Eigenvectors - MIT Mathematics

Chapter 6 Eigenvalues and introduction to EigenvaluesLinear equationsAxDbcome from steady state problems. Eigenvalues have their greatestimportance indynamic problems. The solution ofdu=dtDAuis changing with time growing or decaying or oscillating. We can t find it by elimination. This chapter enters anew part of linear algebra , based onAxD x. All matrices in this chapter are good model comes from the powersA; A2;A3;:::of a matrix. Suppose you need thehundredth powerA100. The starting matrixAbecomes unrecognizable after a few steps,andA100is very close to :6 :6I:4 :4 : :8 :3:2 :7 :70 :45:30 :55 :650 :525:350 :475 :6000 :6000:4000 :4000 AA2A3A100A100was found by using theeigenvaluesofA, not by multiplying 100 matrices.

6.1 Introduction to Eigenvalues Linear equationsAx D bcomefrom steady stateproblems. Eigenvalueshave theirgreatest importance in dynamic problems. The solution of du=dt D Au is changing with time— growing or decaying or oscillating. We can’t find it by elimination. This chapter enters a new part of linear algebra, based on Ax D x.

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