General Discussion
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(66,386 posts)n/t
LiberalArkie
(15,719 posts)about the theocracy taking over.
Bok_Tukalo
(4,323 posts)[img][/img]
pokerfan
(27,677 posts)e ? - ? = 20. It's a good way to check if your calculator is any good.
What is "pi"?
Mathematician: Pi is the number expressing the relationship between the circumference of a circle and its diameter.
Physicist: Pi is 3.1415927 plus or minus 0.00000005
Engineer: Pi is about 3.
Fumesucker
(45,851 posts)FSogol
(45,488 posts)Cheviteau
(383 posts)hunter
(38,317 posts)... I remember pi was on the slide rule. In our "honors" seventh grade class we learned to use slide rules. Our teacher had a giant working slide rule.
http://www.dannychesnut.com/SlideRule/SlideRule.htm
Without the slide rule, on paper, it was 22/7. Or 355/113 for very much overly fussy work.
I don't think an engineer would say "about 3" it would be more like "a bit more than 3."
There are some really cool shortcuts for pi in the integer math often used in computer graphics and sound rendering.
It's an engineering skill to correctly dismiss the unimportant details and recognize the important details.
http://xkcd.com/217
pokerfan
(27,677 posts)but it's fun to weird people out with that expression.
I still have several slide rules and even keep a six inch Pickett in the glove box for calculating mileage. Gets me looks at the pump.
hunter
(38,317 posts)Lucky Luciano
(11,257 posts)...Rational or not. If your equation were exact, then you would also have a proof that pi is rational which it isn't! Very nice approximation though for e to the pi - I never knew that one.
pokerfan
(27,677 posts)See post #10. Still, pi has many rational expressions but they all go to infinity as series.
Lucky Luciano
(11,257 posts)bearssoapbox
(1,408 posts)Bernardo de La Paz
(49,005 posts)Euler's Identity:
panader0
(25,816 posts)Bernardo de La Paz
(49,005 posts)e is the base of natural logarithms and exponentiation. Pi is as we know all about circles. 1 is the identity element for multiplication (has no effect). 0 is the identity element for addition (has no effect). i is the square root of -1, which can't exist in real number space but does exist in the complex numbers.
This all relates to harmonics and many other beautiful parts of mathematics, physics, and engineering.
hunter
(38,317 posts)... but it's still very pretty.
Response to Bernardo de La Paz (Reply #9)
Bernardo de La Paz This message was self-deleted by its author.