Neumann János, Nikola Tesla, Albert Einstein
-
v3ctorsigma #1005 " Second-order phase transitions are continuous in the first derivative (the order parameter, which is the first derivative of the free energy with respect to the external field, is continuous across the transition) but exhibit discontinuity in a second derivative of the free energy.[3] These include the ferromagnetic phase transition"
en.wikipedia.org/wiki/Phase_transition#Ehrenfest_classification
Az egy dolog, hogy kiollózom. De tudom mi hol van. Mert elolvastam...