Sublime
An inspiration engine for ideas
The Sharpe ratio uses standard deviation to determine if an investor is getting enough return for the risk he’s taking. The exam might say that the Sharpe ratio measures the excess return per unit of risk. Mathematically, it would be the actual return you get minus the “riskless rate of return,” divided by the standard deviation.
Robert Walker • Pass The 65: A PLAIN ENGLISH EXPLANATION TO HELP YOU PASS THE SERIES 65 EXAM - UPDATED FOR 2017
That’s just a parabola, the potential for a simple harmonic oscillator.
Sean M. Carroll • The Biggest Ideas in the Universe: Space, Time, and Motion
Very interesting!
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the shape of the potential for an oscillating system in the vicinity of equilibrium takes the approximate form
Sean M. Carroll • The Biggest Ideas in the Universe: Space, Time, and Motion
Hard times – soft sounds. One of my absolute favorite sounds from nature.
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the frequency f is the rate at which the oscillator returns to its starting point, while the angular frequency ω is the rate at which the angle goes from 0 to 2π; they are related by ω = 2π f.
