== 'fourier equation'? == 

 The article states the following: 
 "it was recognized that Fourier equation is in contradiction with the theory of relativity because it admits an infinite speed of propagation of heat signals. For example, according to Fourier equation, a pulse of heat at the origin would be felt at infinity instantaneously. The speed of information propagation is faster than the speed of light in vacuum, which is physically inadmissible within the framework of relativity. Alterations to the Fourier model provided for a relativistic model of heat conduction, avoiding this problem." 
 Grammatical errors aside, I was taught to distinguish the term 'Fourier equation' (as the Heat Equation) from 'Fourier's law'. Which does it mean here?