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Physics Quote by Richard P. Feynman

“Often one postulates that a priori, all states are equally probable. This is not true in the world as we see it. This world is not correctly described by the physics which assumes this postulate.” quote by Richard P. Feynman
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“Often one postulates that a priori, all states are equally probable. This is not true in the world as we see it. This world is not correctly described by the physics which assumes this postulate.”

Richard P. Feynman

About This Quote

Source Lecture: The Character of Physical Law, 1965

Assuming all possibilities equally likely is unrealistic; real-world probabilities differ.

In simple terms: Equal chance assumption is false in reality.

Key Takeaway

Question assumptions about probability.

Themes

probability physics reality

Mood

analytical skeptical

Type

philosophical scientific

When to use this quote

  • weather forecasting
  • financial risk
  • medical diagnosis

Key Concepts

statistical modeling scientific reasoning

Questions to Reflect On

  • When do you rely on equal probability?
  • What evidence challenges this view?
A Different Perspective

Models may oversimplify complex systems.

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