# Thread: Mathematical equations and formulas

1. Originally Posted by shoshana
tis a beautiful equation i hope it can not be disproved

http://www.nytimes.com/2011/09/30/op...as30.html?_r=1
Holy crap, they can't make the theory wrong because of 60 nanoseconds! Specially because Einstein is the most famous INTP representative.

2. Originally Posted by _Poki_
Soh Cah Toa

its the one I have found the most useful
Related: Cao Sha Cho.

Originally Posted by gmanyo
I've always hated equations. Memorizing boring shit that I don't care about. If I had to pick one I'd go with f'(x) = (limit as h approaches 0) f(x+h) - f(x) / h (the function for derivatives) because derivatives and integrals are awesome concepts
Another useful formula: f'(x)=y+dy=f(x+dx). Solve for dy/dx to find the derivative. Equally effective and much easier than limits.

Originally Posted by gmanyo
...and that equation is less about memorizing what numbers go where than it is about understanding larger ideas.
That's what math is about, and it often isn't taught that way.

Other than that, I tend to like miscellaneous mathematical formulae I've derived.

3. Also recently just learned about Lorentz Transformations (from Yale!):

Really awesome. Relates how people view time, space, order of events, length of objects, etc. from relative velocity. Go Einstein!
(These are the main equations of relativity which lead to the more famous E=mc^2)

4. Originally Posted by Saslou
Hey guys ..

I would like to know what your all time favourite mathematical equation/formula is.
But I hate maths.

5. Originally Posted by Helios
But I hate maths.

That's OK .. Just rep me your all time favourite <Insert anything here>

6. The Gaussian distribution:

7. If I understood the Schrödinger equation I would probably like that one.

8. Bayes' rule.

It's magical.

9. WTF? People actually have favorite formulas? This is news to me.

10. Ohm's Law
For many conductors of electricity, the electric current which will flow through them is directly proportional to the voltage applied to them. When a microscopic view of Ohm's law is taken, it is found to depend upon the fact that the drift velocity of charges through the material is proportional to the electric field in the conductor. The ratio of voltage to current is called the resistance, and if the ratio is constant over a wide range of voltages, the material is said to be an "ohmic" material. If the material can be characterized by such a resistance, then the current can be predicted from the relationship:

Ohm's Law - I=V/R or Electric Current = Voltage / Resistance

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