| 摘 要： | The initial problem for second order linear evolution equation systems is discussed byusing the contraction semigroup theory.A kind of initial value problem for second order isalso discussed with variable coefficients for evolution equations by using the analyticalsemigroup theory,and is unified with the solutions of the initial value problem for this classof equations and those of first order temporally inhomogeneous evolution equations.This isan important class of equations in mathematical mechanics.
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