Mike Flynn
  • Member for 9 years, 6 months
  • Last seen this week
What is a covector and what is it used for?
16 votes

The answers here are all excellent and in depth, but I might also admit, a little abstract and intimidating. I'd like to present a concrete reason for covectors to exist: to make the concept of dot ...

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Regarding uses of $i$ (square root of $-1$)
3 votes

The Schrodinger Equation: $\frac{-\hbar}{2m}\frac{d^2\psi}{ dx^2} + V\psi = i\hbar\frac{d\psi}{dt}$ is just one of very many.

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compute perpedicular vector component
0 votes

Remember the dot product $u*v = |u||v|\cos{\theta}$ where $\theta$ is the angle between them. If you then remember projection, with $u$ projected onto $v$ being $\frac{v}{|v|} * |u|\cos{\theta}$, you ...

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Random Point on Infinite Line Paradox
0 votes

Your point is uniformly distributed throughout the entire real line, from $-\infty$ to $\infty$. No, you will never find your point, ever. It is trivial to show that this is absurd, but imagine the ...

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