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"There is a well-worn definition of physics that it the study of matter and \
energy. I do not like that definition, as it is almost misleading unless you \
already know what matter and energy are\[LongDash]and those questions have \
not been settled to this day. Physics concerns itself with discovering the \
most fundamental principles of the universe around us. This boils down to \
understanding the most elementary constituents of matter and the interactions \
between them.\n\tWait a minute! What about energy? The truth is we do not \
really know what energy is. We can calculate energy for many different \
situations. We can use these calculations to learn about different \
situations, but these calculations are completely abstract. They result from \
the study of matter and its interactions. All we know about energy is that it \
is some number we can calculate and then use in other calculations.\n\tAll \
attempts to study matter and/or its interactions are either experimental or \
they are based on attempts to represent physical phenomena mathematically or \
on a computer. This allows us to use the rules of the type of mathematics \
being used, or the type of computer simulation, to predict the physical \
phenomena.\n\tThe attempt to understand matter by studying idealized objects \
without regard to shape or size of the object is called ",
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". The first step in understanding any physical phenomena is to try to \
simplify things by removing as many complications as possible without \
destroying the phenomena in the process. Then we working out all of the \
consequences of that simplified phenomena. The particle is this kind of \
simplification. Often such a simple explanation is very rich in",
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" consequences. In the last century, particle theory has also taken on a \
definition relating to subatomic particles. We only have so many words, and \
they often must be used in many different ways in the same field. The \
mathematics of simplified particles is the analytic geometry of points, basic \
calculus, and ordinary differential equations.\n\tThe attempt to understand \
interactions between collections of matter by examining properties that seem \
to be everywhere is called ",
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temperature exists everywhere we are considering, we call it a temperature \
field. The mathematics of fields are the theories of scalar, vector, and \
tensor fields, and partial differential equations.\n\tThe theories of matter \
are the result of the inevitable complication of ",
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" Once we have studied many simple ideas, we need to make them more \
realistic by reintroducing some of the complications that we removed in the \
process of simplification. We can treat matter in bulk as a kind of matter \
field. This kind of idea is sometimes called a ",
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eyes. The mathematics of continuous matter is the theory of tensor fields and \
partial differential equations. We can also examine matter and the \
interactions of matter at ever smaller scales, where the simple ideas no \
longer hold\[LongDash]this is called a ",
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". The mathematics of quantum physics is abstract algebra, probability \
theory, and partial differential equations. We can take the point of few that \
matter consists of a huge number of fundamental elements and determine the \
properties of it by examining the collection, this is a ",
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". The mathematics of statistical physics is statistics and probability.\n",
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" is a collection of disciplines that use physics to describe specific \
phenomena. These have the character of being much more complicated than pure \
physics, since they deal with situations where the simplifications of pure \
physics often do not ",
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" The simplified theories of pure physics have removed complications that \
must be considered in the more realistic situations covered by applied \
physics. Here we include astrophysics, atmospheric physics, biophysics, \
physical chemistry, the physical theory of computation and information, \
electronics, engineering physics, geophysics, physical hydrology, materials \
physics, and physical oceanography. The mathematics of applied physics varies \
depending upon the ideas being used.\n\tSo we can expand our definition of \
physics. Physics is the process of considering some physical phenomena, \
establishing a theory, predicting its consequences, and either confirming or \
refuting it. How do we predict the consequences of a physical theory?"
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