29802
Introduction Maxwell 's equations in the standard vector calculus formalism , in an inhomogeneous medium with sources , are : The media is assumed to be linear , that is where ε = ε ( r , t ) is the permittivity of the medium and μ = μ ( r , t ) the permeability of the medium ( see constitutive equation ) .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None