• MATTER, SPACE, MASS, INERTIAL MASS, GRAVITATIONAL MASS AND THEIR RELATIONS

S ome fundamental concepts required to understand, analyze and solve problems in any area are defined through their properties understandable at a given time and space. Properties of fundamental concepts known at a given time and space are not in general invariant at all times, consequently a definition of a fundamental concept will change. Further a fundamental concept is associated with many properties known at a given time, it may have properties unknown at that time. A fundamental concept may give rise to many properties but a given set of properties cannot uniquely define the fundamental concepts. This is the drawback in the definition of a fundamental concept through its properties. For example the definition of  death, we define death by the failure of certain organs, no doubt for a dead person many organs may fail but failure of these organs may not lead to death. Another fundamental concept in philosophy is God. God is defined through many properties, God may have all these properties but if any entity also has all these properties it does not mean that the entity is the God.