La función de la doctrina heraclítea en el Teeteto

in this paper i try to show that the function of the heraclitean doctrine in the theetetus is to argue for the equivalence between the protagorean thesis and theetetus'first definition "perception is knowledge", and therefore the doctrine supports the relativity of knowledge. this reading goes against the interpretation according to which plato introduces this doctrine because he believes it is right about that which is perceptible through the senses; but it goes a step beyond the interpretation which sustains that plato introduces this doctrine as an ontological thesis to support the protagorean thesis.