How to add an element of derived data to a Django model?

I have a Django Model as follows:

            

class myModel(models.Model):

a = models.IntegerField()

b = models.IntegerField()

I want to add a models.BooleanField() named c to the myModel class. However the value of c is simply derived from a and b so I don't want it to be stored in the Database. 

I want to c to be True if a > b, otherwise False. I want c to reflect the correct/current value even when a and b get modifed. And I want to be able to access c using myModel.c just like I can access a and b.

Is there any way to do this?

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