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01232012, 07:27 PM #21
 Join Date
 Mar 2011
 MBTI
 INTP
 Enneagram
 5w6 sp/sx
 Posts
 5,890

01242012, 07:50 AM #22
 Join Date
 Dec 2011
 MBTI
 ISTP
 Enneagram
 9w1 sp/sx
 Posts
 128
Related: Cao Sha Cho.
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.
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.Thinkist: not optimist nor pessimist. I am primarily competent in the enneagram.
SX 9w1, SP 5w6, SP 3w4  Split with the first two
TiSeSiNiTeFiNeFe. I'm always questioning this, particularly the Si.
Big 5/Global5/SLOAN: RCUEX

01242012, 10:30 AM #23
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)

01242012, 09:35 PM #24

01242012, 09:40 PM #25“I made you take time to look at what I saw and when you took time to really notice my flower, you hung all your associations with flowers on my flower and you write about my flower as if I think and see what you think and see—and I don't.”
― Georgia O'Keeffe

01252012, 02:51 AM #26
 Join Date
 Jan 2012
 Posts
 6
The Gaussian distribution:

01252012, 03:40 AM #27

01252012, 02:22 PM #28
Bayes' rule.
It's magical.

01262012, 04:27 AM #29
WTF? People actually have favorite formulas? This is news to me.
Chimera of Filth
A gruesome beast with dripping flesh
Clings to me as a sick fixture
My throbbing heart it gnawed apart
It stalks and hunts me through mirrors

05042012, 06:29 AM #30
 Join Date
 Mar 2012
 MBTI
 INTJ
 Enneagram
 5w6 sx/so
 Socionics
 Will
 Posts
 5,918
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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