Maths joke...

Huh huh huh

Liam

Nope. Square route of minus 1? Don't get it

sq root -1 is an imaginary number.

Now, if the friend had been called Jay, it would have been obvious

ETA, that's not a geeky joke anyway, it's just very high brow.

[Edited on 24/5/08 by ravingfool]

That calculation is not possible, that's the joke.....

I think the joke is - kids often have an imaginary friend. sqrt -1 is an imaginary number. so...

bog wall when I was at uni

integral of 1/cabin with respect to cabin is




log cabin


looks better written properly.....

quote:

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Originally posted by Bob C
bog wall when I was at uni

integral of 1/cabin with respect to cabin is




log cabin


looks better written properly.....

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dont forget that the log cabin is by the c

Alternative one is integral(poly'/poly) = Ln Poly

[Edited on 25/5/08 by Tim 45]

quote:

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Originally posted by t.j.


That calculation is not possible, that's the joke.....

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this is all well over my head so im going to sit quietly in the corner

See here
http://en.wikipedia.org/wiki/Imaginary_number

Us quantum physicists don't see the point of the joke.

Well i think it's funny.

LOL brilliant

i just read it as inv rt -1 being unsolvable, knowing its an imaginary number would make it more amusing i suppose.

Where do you get taught about imaginary numbers? I did maths A-level and a little with my degree, but never came across the subject.

quote:

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Originally posted by JoelP
i just read it as inv rt -1 being unsolvable, knowing its an imaginary number would make it more amusing i suppose.

Where do you get taught about imaginary numbers? I did maths A-level and a little with my degree, but never came across the subject.

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It's very big in electronics once you start dealing with mixed resistance and capacitive or inductive reactance.

Z = x +jY ohms etc

Did a fair bit on complex numbers and Laplace transforms in my A-level (but that was 25 ish years ago).

you cover it more at A level if you do a double A level in maths. Then of course most types of engineering will have you messing around with them I would have thought as noted above.

Imaginary numbers come up as a topic a lot in quantum physics, not that I know anything about them. Mores the pity I'd love to be able to see that side of things, a bit jealous of folk who are good at math, never taught it properly at school right from day one

I find them easiest to visualise as a simple graph. i.e. as another number line at 90 degrees to the real numbers. Then complex numbers are just a point with an x, y coordinate. But it all gets a bit hairy quickly after that.



Though I got very confused when I didn't realise mathematicians tend to use i and engineers j to represent them.

This link seems good on them, but you need reasonable algebra to keep up.
http://www.clarku.edu/~djoyce/complex/

interesting, kind of see where thats going

I think it's only us electricals that use j instead of i so we dont get confused with current.

It all got really horrible in ac circuit analysis using the polar form and then using euler's identity to express ac signals as exponentials etc etc. Aaaaaaaaaggggggghhhhhhh major nightmares, and that was only first year stuff. Glad i've now defected to the light side and become a mechanical!

Liam