Question: How can I substitute the new functions for old ones into another function?

In the name of God

Dear my friends

Hi

 I have a function as the following:

 temp:=phi(Lambda(tau, 0), tau, 0)+((D[1](phi))(Lambda(tau, 0), tau, 0)*(D[2](Lambda))(tau, 0)+(D[3](phi))(Lambda(tau, 0), tau, 0))*q;

 I have equivalent functions for Lambda(tau,0) and phi(Lambda(tau,0),tau,0) as the following:

 c[0](tau) instead of Lambda(tau,0)

y[0](c[0](tau),tau) instead of phi(Lambda(tau,0),tau,0)

How can I substitute the functions of c[0](tau)  and y[0](c[0](tau),tau) for Lambda(tau,0) and phi(Lambda(tau,0),tau,0) into temp expression, respectively?

Best wishes

 

 

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