Write the following list of characters into a correctly formed sentence: JohnCrankisbestknownforhisjointworkwithPhyllisNicolsonontheheatequation,whereacontinuoussolutionu(x,t)isrequiredwhichsatisfiesthesecondorderpartialdifferentialequation
John Crank is best known for his joint work with Phyllis Nicolson on the heat equation, where a continuous solution u(x, t) is required which satisfies the second order partial differential equation