Symmetry methods applied to the mathematical model of a tumor of the brain
We use symmetry methods to study the model of growth of a tumor proposed by L. Wein and D. Koplow. The aim is to show that generalisations of the assumption of uniformity in the model may be made without unnecessary intial assumptions. This shows the use of symmetries to obtain more complex and reliable models. We translate some of the properties into properties of the tumor of the brain.