  In this article we are willing to give some first steps to quantum mechanics
and a motivation of quantum mechanics and its interpretation for undergraduate
students not from physics. After a short historical review in the development
we discuss philosophical, physical and mathematical interpretation. We define
local realism, locality and hidden variable theory which ends up in the EPR
paradox, a place where questions on completeness and reality comes into play.
The fundamental result of the last century was maybe Bell's that states that
local realism is false if quantum mechanics is true. From this fact we can
obtain the so called Bell inequalities. After a didactic example of the fact
what these inequalities means we describe the key concept of quantum
entanglement motivated here by quantum information theory. Also classical
entropy and von Neuman entropy is discussed.
