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d
 dark matter
"Dark matter" is a name that’s been given to a substance which many scientists believe may exist. If it exists, this(...)  Read More
 de BroglieBohm interpretation of quantum mechanics
This interpretation of quantum mechanics is also called the "Bohmian Interpretation." It was originally proposed by(...)  Read More
 decoherence
(Also called "quantum decoherence.”) Decoherence occurs when a quantum particle loses(...)  Read More
 dimensionless number
Pi is an example of a dimensionless number. A dimensionless number doesn’t imply any measurement units. Pi is just 3.14, not(...)  Read More
 dynamic system
A dynamic system is a system that changes over time. It can also be called a "dynamical system." While some maintain that(...)  Read More
 dynamical system
See dynamic system.  Read More

e
 e
e is the symbol for Euler's number. Similarly to pi, e is a constant which occurs repeatedly throughout nature. It has a(...)  Read More
 Euler's number (e)
Euler's number, similarly to pi, is a constant which occurs repeatedly throughout nature. It is symbolized as e. It has a(...)  Read More
 experimental physics
For experimental physics, see theoretical physics.  Read More

f
 finestructure constant
See alpha, , α.  Read More
 Free Will Theorem
Do quantum particles have free will? Can they make choices? Some physicists have considered this question seriously. But(...)  Read More
 frequency
Frequency is the number of repeated motions in a period of time. These motions can be up and down, like a hammer, or back(...)  Read More
 frequency and wavelength
Frequency and wavelength are both properties of waves. They are closely related, so this article discusses the two(...)  Read More
 function
The term “function” is important in the field of quantum mechanics because is it the basis of the key term “wave function.”(...)  Read More

g
 Guiding Wave Interpretation of quantum mechanics
The Guiding Wave Interpretation of quantum mechanics is also called the "Bohmian Interpretation" as David Bohm was one of(...)  Read More

h
 Heisenberg Uncertainty Principle (HUP)
The Heisenberg Uncertainty Principle (HUP) is also called the “Indeterminacy Principle” or simply, the "Uncertainty(...)  Read More
 HUP
“HUP” stands for the Heisenberg Uncertainty Principle, which see.  Read More

i
 i
The letter i is the symbol for the square root of 1. In other words i = √1. The symbol i often appears in the equations of(...)  Read More
 idealism
In ordinary English, "idealism" is contrasted with pragmatism. "Idealism" refers to the prioritizing of ideals. The meaning(...)  Read More