Show that the solution u(t, x) of the initial value problem du +ar-; du t > 0, x € R at u(0, x) = f(x) (ƒ € C³(R) given) can be expressed as follows:

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Q: (2) Show the argument below is invalid (¬q ^ r) → ¬8 -pAr 8 V p^m .. 8 m

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