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chance.pdf
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chance.pdf
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Chance, Choice, and Change
or
Can Random Events Follow Laws?
ISC1057
Janet Peterson and John Burkardt
Computational Thinking
Fall Semester 2016
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In this section of the course, we will look at things that seem to
have an element of chance or randomness.
We will try to understand how randomness can be created,
understood, and measured.
We will look at common instances of randomness, especially games
of chance.
We will talk about measuring the kinds of randomness, and how it
is possible for a computer to simulate random behaviors.
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In 1946, Stanlislaw Ulam was a physicist working at Los Alamos,
trying to predict the behavior of a beam of neutrons that penetrate
a material.
If a neutron collides with an atom in the material, it can be
absorbed, be deflected at a new angle and speed, or cause the
atom to split.
For one neutron and one collision, Ulam could estimate the
probability of each event. The problem was that a single neutron
might cause many collisions, with the outcome different each time.
Getting a useful answer meant estimating the behavior of many
neutrons and many collisions, which seemed impossible to
calculate.
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