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Question: Guidance on replacement???

Question:Guidance on replacement???

delvin 60 Maple 2024
ode substitution differential-equations duplicate-question
May 16 2025
1

 Hi,

How can I replace all the expressions diff(G(xi), xi)/G(xi) with the new variable w(xi) in the next step? (Even the ones that have powers)

NULL

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eq2 := c*a0*(-lambda*diff(G(xi), xi) - mu*G(xi))/G(xi) - c*a0*diff(G(xi), xi)^2/G(xi)^2 - alpha*a0*diff(G(xi), xi)/((1 - 2*f(sqrt(lambda^2 - 4*mu)*y)*diff(G(xi), xi)/(sqrt(epsilon*lambda^2 - 4*epsilon*mu)*G(xi)) - f(sqrt(lambda^2 - 4*mu)*y)*lambda/sqrt(epsilon*lambda^2 - 4*epsilon*mu))*G(xi)) - alpha*a0*lambda/(2*(1 - 2*f(sqrt(lambda^2 - 4*mu)*y)*diff(G(xi), xi)/(sqrt(epsilon*lambda^2 - 4*epsilon*mu)*G(xi)) - f(sqrt(lambda^2 - 4*mu)*y)*lambda/sqrt(epsilon*lambda^2 - 4*epsilon*mu))) + alpha*a0*sqrt(epsilon*lambda^2 - 4*epsilon*mu)*epsilon*f(sqrt(lambda^2 - 4*mu)*y)/(2*(1 - 2*f(sqrt(lambda^2 - 4*mu)*y)*diff(G(xi), xi)/(sqrt(epsilon*lambda^2 - 4*epsilon*mu)*G(xi)) - f(sqrt(lambda^2 - 4*mu)*y)*lambda/sqrt(epsilon*lambda^2 - 4*epsilon*mu))) + alpha*a0*diff(G(xi), xi)/((1 + 2*f(sqrt(lambda^2 - 4*mu)*y)*diff(G(xi), xi)/(sqrt(epsilon*lambda^2 - 4*epsilon*mu)*G(xi)) + f(sqrt(lambda^2 - 4*mu)*y)*lambda/sqrt(epsilon*lambda^2 - 4*epsilon*mu))*G(xi)) + alpha*a0*lambda/(2*(1 + 2*f(sqrt(lambda^2 - 4*mu)*y)*diff(G(xi), xi)/(sqrt(epsilon*lambda^2 - 4*epsilon*mu)*G(xi)) + f(sqrt(lambda^2 - 4*mu)*y)*lambda/sqrt(epsilon*lambda^2 - 4*epsilon*mu))) + alpha*a0*sqrt(epsilon*lambda^2 - 4*epsilon*mu)*epsilon*f(sqrt(lambda^2 - 4*mu)*y)/(2*(1 + 2*f(sqrt(lambda^2 - 4*mu)*y)*diff(G(xi), xi)/(sqrt(epsilon*lambda^2 - 4*epsilon*mu)*G(xi)) + f(sqrt(lambda^2 - 4*mu)*y)*lambda/sqrt(epsilon*lambda^2 - 4*epsilon*mu))) - beta*a0^2*diff(G(xi), xi)^2/(G(xi)^2*(1 - 2*f(sqrt(lambda^2 - 4*mu)*y)*diff(G(xi), xi)/(sqrt(epsilon*lambda^2 - 4*epsilon*mu)*G(xi)) - f(sqrt(lambda^2 - 4*mu)*y)*lambda/sqrt(epsilon*lambda^2 - 4*epsilon*mu))) - beta*a0^2*diff(G(xi), xi)*lambda/(2*(1 - 2*f(sqrt(lambda^2 - 4*mu)*y)*diff(G(xi), xi)/(sqrt(epsilon*lambda^2 - 4*epsilon*mu)*G(xi)) - f(sqrt(lambda^2 - 4*mu)*y)*lambda/sqrt(epsilon*lambda^2 - 4*epsilon*mu))*G(xi)) + beta*a0^2*diff(G(xi), xi)*sqrt(epsilon*lambda^2 - 4*epsilon*mu)*epsilon*f(sqrt(lambda^2 - 4*mu)*y)/(2*(1 - 2*f(sqrt(lambda^2 - 4*mu)*y)*diff(G(xi), xi)/(sqrt(epsilon*lambda^2 - 4*epsilon*mu)*G(xi)) - f(sqrt(lambda^2 - 4*mu)*y)*lambda/sqrt(epsilon*lambda^2 - 4*epsilon*mu))*G(xi)) + beta*a0^2*diff(G(xi), xi)^2/(G(xi)^2*(1 + 2*f(sqrt(lambda^2 - 4*mu)*y)*diff(G(xi), xi)/(sqrt(epsilon*lambda^2 - 4*epsilon*mu)*G(xi)) + f(sqrt(lambda^2 - 4*mu)*y)*lambda/sqrt(epsilon*lambda^2 - 4*epsilon*mu))) + beta*a0^2*diff(G(xi), xi)*lambda/(2*(1 + 2*f(sqrt(lambda^2 - 4*mu)*y)*diff(G(xi), xi)/(sqrt(epsilon*lambda^2 - 4*epsilon*mu)*G(xi)) + f(sqrt(lambda^2 - 4*mu)*y)*lambda/sqrt(epsilon*lambda^2 - 4*epsilon*mu))*G(xi)) + beta*a0^2*diff(G(xi), xi)*sqrt(epsilon*lambda^2 - 4*epsilon*mu)*epsilon*f(sqrt(lambda^2 - 4*mu)*y)/(2*(1 + 2*f(sqrt(lambda^2 - 4*mu)*y)*diff(G(xi), xi)/(sqrt(epsilon*lambda^2 - 4*epsilon*mu)*G(xi)) + f(sqrt(lambda^2 - 4*mu)*y)*lambda/sqrt(epsilon*lambda^2 - 4*epsilon*mu))*G(xi)) - gamma*a0^3*diff(G(xi), xi)^3/(G(xi)^3*(1 - 2*f(sqrt(lambda^2 - 4*mu)*y)*diff(G(xi), xi)/(sqrt(epsilon*lambda^2 - 4*epsilon*mu)*G(xi)) - f(sqrt(lambda^2 - 4*mu)*y)*lambda/sqrt(epsilon*lambda^2 - 4*epsilon*mu))) - gamma*a0^3*diff(G(xi), xi)^2*lambda/(2*G(xi)^2*(1 - 2*f(sqrt(lambda^2 - 4*mu)*y)*diff(G(xi), xi)/(sqrt(epsilon*lambda^2 - 4*epsilon*mu)*G(xi)) - f(sqrt(lambda^2 - 4*mu)*y)*lambda/sqrt(epsilon*lambda^2 - 4*epsilon*mu))) + gamma*a0^3*diff(G(xi), xi)^2*sqrt(epsilon*lambda^2 - 4*epsilon*mu)*epsilon*f(sqrt(lambda^2 - 4*mu)*y)/(2*G(xi)^2*(1 - 2*f(sqrt(lambda^2 - 4*mu)*y)*diff(G(xi), xi)/(sqrt(epsilon*lambda^2 - 4*epsilon*mu)*G(xi)) - f(sqrt(lambda^2 - 4*mu)*y)*lambda/sqrt(epsilon*lambda^2 - 4*epsilon*mu))) + gamma*a0^3*diff(G(xi), xi)^3/(G(xi)^3*(1 + 2*f(sqrt(lambda^2 - 4*mu)*y)*diff(G(xi), xi)/(sqrt(epsilon*lambda^2 - 4*epsilon*mu)*G(xi)) + f(sqrt(lambda^2 - 4*mu)*y)*lambda/sqrt(epsilon*lambda^2 - 4*epsilon*mu))) + gamma*a0^3*diff(G(xi), xi)^2*lambda/(2*G(xi)^2*(1 + 2*f(sqrt(lambda^2 - 4*mu)*y)*diff(G(xi), xi)/(sqrt(epsilon*lambda^2 - 4*epsilon*mu)*G(xi)) + f(sqrt(lambda^2 - 4*mu)*y)*lambda/sqrt(epsilon*lambda^2 - 4*epsilon*mu))) + gamma*a0^3*diff(G(xi), xi)^2*sqrt(epsilon*lambda^2 - 4*epsilon*mu)*epsilon*f(sqrt(lambda^2 - 4*mu)*y)/(2*G(xi)^2*(1 + 2*f(sqrt(lambda^2 - 4*mu)*y)*diff(G(xi), xi)/(sqrt(epsilon*lambda^2 - 4*epsilon*mu)*G(xi)) + f(sqrt(lambda^2 - 4*mu)*y)*lambda/sqrt(epsilon*lambda^2 - 4*epsilon*mu)));

c*a0*(-lambda*(diff(G(xi), xi))-mu*G(xi))/G(xi)-c*a0*(diff(G(xi), xi))^2/G(xi)^2-alpha*a0*(diff(G(xi), xi))/((1-2*f((lambda^2-4*mu)^(1/2)*y)*(diff(G(xi), xi))/((epsilon*lambda^2-4*epsilon*mu)^(1/2)*G(xi))-f((lambda^2-4*mu)^(1/2)*y)*lambda/(epsilon*lambda^2-4*epsilon*mu)^(1/2))*G(xi))-alpha*a0*lambda/(2-4*f((lambda^2-4*mu)^(1/2)*y)*(diff(G(xi), xi))/((epsilon*lambda^2-4*epsilon*mu)^(1/2)*G(xi))-2*f((lambda^2-4*mu)^(1/2)*y)*lambda/(epsilon*lambda^2-4*epsilon*mu)^(1/2))+alpha*a0*(epsilon*lambda^2-4*epsilon*mu)^(1/2)*epsilon*f((lambda^2-4*mu)^(1/2)*y)/(2-4*f((lambda^2-4*mu)^(1/2)*y)*(diff(G(xi), xi))/((epsilon*lambda^2-4*epsilon*mu)^(1/2)*G(xi))-2*f((lambda^2-4*mu)^(1/2)*y)*lambda/(epsilon*lambda^2-4*epsilon*mu)^(1/2))+alpha*a0*(diff(G(xi), xi))/((1+2*f((lambda^2-4*mu)^(1/2)*y)*(diff(G(xi), xi))/((epsilon*lambda^2-4*epsilon*mu)^(1/2)*G(xi))+f((lambda^2-4*mu)^(1/2)*y)*lambda/(epsilon*lambda^2-4*epsilon*mu)^(1/2))*G(xi))+alpha*a0*lambda/(2+4*f((lambda^2-4*mu)^(1/2)*y)*(diff(G(xi), xi))/((epsilon*lambda^2-4*epsilon*mu)^(1/2)*G(xi))+2*f((lambda^2-4*mu)^(1/2)*y)*lambda/(epsilon*lambda^2-4*epsilon*mu)^(1/2))+alpha*a0*(epsilon*lambda^2-4*epsilon*mu)^(1/2)*epsilon*f((lambda^2-4*mu)^(1/2)*y)/(2+4*f((lambda^2-4*mu)^(1/2)*y)*(diff(G(xi), xi))/((epsilon*lambda^2-4*epsilon*mu)^(1/2)*G(xi))+2*f((lambda^2-4*mu)^(1/2)*y)*lambda/(epsilon*lambda^2-4*epsilon*mu)^(1/2))-beta*a0^2*(diff(G(xi), xi))^2/(G(xi)^2*(1-2*f((lambda^2-4*mu)^(1/2)*y)*(diff(G(xi), xi))/((epsilon*lambda^2-4*epsilon*mu)^(1/2)*G(xi))-f((lambda^2-4*mu)^(1/2)*y)*lambda/(epsilon*lambda^2-4*epsilon*mu)^(1/2)))-(1/2)*beta*a0^2*(diff(G(xi), xi))*lambda/((1-2*f((lambda^2-4*mu)^(1/2)*y)*(diff(G(xi), xi))/((epsilon*lambda^2-4*epsilon*mu)^(1/2)*G(xi))-f((lambda^2-4*mu)^(1/2)*y)*lambda/(epsilon*lambda^2-4*epsilon*mu)^(1/2))*G(xi))+(1/2)*beta*a0^2*(diff(G(xi), xi))*(epsilon*lambda^2-4*epsilon*mu)^(1/2)*epsilon*f((lambda^2-4*mu)^(1/2)*y)/((1-2*f((lambda^2-4*mu)^(1/2)*y)*(diff(G(xi), xi))/((epsilon*lambda^2-4*epsilon*mu)^(1/2)*G(xi))-f((lambda^2-4*mu)^(1/2)*y)*lambda/(epsilon*lambda^2-4*epsilon*mu)^(1/2))*G(xi))+beta*a0^2*(diff(G(xi), xi))^2/(G(xi)^2*(1+2*f((lambda^2-4*mu)^(1/2)*y)*(diff(G(xi), xi))/((epsilon*lambda^2-4*epsilon*mu)^(1/2)*G(xi))+f((lambda^2-4*mu)^(1/2)*y)*lambda/(epsilon*lambda^2-4*epsilon*mu)^(1/2)))+(1/2)*beta*a0^2*(diff(G(xi), xi))*lambda/((1+2*f((lambda^2-4*mu)^(1/2)*y)*(diff(G(xi), xi))/((epsilon*lambda^2-4*epsilon*mu)^(1/2)*G(xi))+f((lambda^2-4*mu)^(1/2)*y)*lambda/(epsilon*lambda^2-4*epsilon*mu)^(1/2))*G(xi))+(1/2)*beta*a0^2*(diff(G(xi), xi))*(epsilon*lambda^2-4*epsilon*mu)^(1/2)*epsilon*f((lambda^2-4*mu)^(1/2)*y)/((1+2*f((lambda^2-4*mu)^(1/2)*y)*(diff(G(xi), xi))/((epsilon*lambda^2-4*epsilon*mu)^(1/2)*G(xi))+f((lambda^2-4*mu)^(1/2)*y)*lambda/(epsilon*lambda^2-4*epsilon*mu)^(1/2))*G(xi))-gamma*a0^3*(diff(G(xi), xi))^3/(G(xi)^3*(1-2*f((lambda^2-4*mu)^(1/2)*y)*(diff(G(xi), xi))/((epsilon*lambda^2-4*epsilon*mu)^(1/2)*G(xi))-f((lambda^2-4*mu)^(1/2)*y)*lambda/(epsilon*lambda^2-4*epsilon*mu)^(1/2)))-(1/2)*gamma*a0^3*(diff(G(xi), xi))^2*lambda/(G(xi)^2*(1-2*f((lambda^2-4*mu)^(1/2)*y)*(diff(G(xi), xi))/((epsilon*lambda^2-4*epsilon*mu)^(1/2)*G(xi))-f((lambda^2-4*mu)^(1/2)*y)*lambda/(epsilon*lambda^2-4*epsilon*mu)^(1/2)))+(1/2)*gamma*a0^3*(diff(G(xi), xi))^2*(epsilon*lambda^2-4*epsilon*mu)^(1/2)*epsilon*f((lambda^2-4*mu)^(1/2)*y)/(G(xi)^2*(1-2*f((lambda^2-4*mu)^(1/2)*y)*(diff(G(xi), xi))/((epsilon*lambda^2-4*epsilon*mu)^(1/2)*G(xi))-f((lambda^2-4*mu)^(1/2)*y)*lambda/(epsilon*lambda^2-4*epsilon*mu)^(1/2)))+gamma*a0^3*(diff(G(xi), xi))^3/(G(xi)^3*(1+2*f((lambda^2-4*mu)^(1/2)*y)*(diff(G(xi), xi))/((epsilon*lambda^2-4*epsilon*mu)^(1/2)*G(xi))+f((lambda^2-4*mu)^(1/2)*y)*lambda/(epsilon*lambda^2-4*epsilon*mu)^(1/2)))+(1/2)*gamma*a0^3*(diff(G(xi), xi))^2*lambda/(G(xi)^2*(1+2*f((lambda^2-4*mu)^(1/2)*y)*(diff(G(xi), xi))/((epsilon*lambda^2-4*epsilon*mu)^(1/2)*G(xi))+f((lambda^2-4*mu)^(1/2)*y)*lambda/(epsilon*lambda^2-4*epsilon*mu)^(1/2)))+(1/2)*gamma*a0^3*(diff(G(xi), xi))^2*(epsilon*lambda^2-4*epsilon*mu)^(1/2)*epsilon*f((lambda^2-4*mu)^(1/2)*y)/(G(xi)^2*(1+2*f((lambda^2-4*mu)^(1/2)*y)*(diff(G(xi), xi))/((epsilon*lambda^2-4*epsilon*mu)^(1/2)*G(xi))+f((lambda^2-4*mu)^(1/2)*y)*lambda/(epsilon*lambda^2-4*epsilon*mu)^(1/2)))

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