08 Jul '08 22:29>
I vaguely remember this term from high school--either adv. algebra or trig. Anybody care to remind me what they are? And is infinity an imaginary number?
Originally posted by PinkFloydIf you just use normal numbers then you cannot find the square root of negative numbers ... imaginary numbers are tacked on so that you can
I vaguely remember this term from high school--either adv. algebra or trig. Anybody care to remind me what they are? And is infinity an imaginary number?
Originally posted by flexmoreLike the square root of minus one. They call it "i" for want of a better name. It just is a symbol that means whatever the square root of minus one really is, we don't know exactly what, but we are going to call it 'i'.
If you just use normal numbers then you cannot find the square root of negative numbers ... imaginary numbers are tacked on so that you can
Originally posted by PinkFloydTry to solve the equation x^2=-1. There are no solution with ordinary numbers but if you introduce a number "i" with the property that i^2 = -1 the equation is solvable.
I vaguely remember this term from high school--either adv. algebra or trig. Anybody care to remind me what they are? And is infinity an imaginary number?
Originally posted by sonhouseThere is no "whatever the square root of minus one really is" to it - that sort of implies that i lies somewhere on the real number line, which it doesn't. We know precisely what the square root of minus one is - it is the square root of minus one. There is no other way of writing it! (other than, say, 0.5*sqrt(-4), but that's just being petty.)
It just is a symbol that means whatever the square root of minus one really is, we don't know exactly what, but we are going to call it 'i'.
Originally posted by SwlabrThat is a mere description, not any kind of deep understanding. We call this unknown quantity i and have logic that proves it works, thats about all we can say about it. Not exactly a fundamental understanding.
There is no "whatever the square root of minus one really is" to it - that sort of implies that i lies somewhere on the real number line, which it doesn't. We know precisely what the square root of minus one is - it is the square root of minus one. There is no other way of writing it! (other than, say, 0.5*sqrt(-4), but that's just being petty.)
Originally posted by Swlabrit does not imply that it lies on the real number line ... the real number line is just a play toy like the other contrived number sets.
There is no "whatever the square root of minus one really is" to it - that sort of implies that i lies somewhere on the real number line, which it doesn't. We know precisely what the square root of minus one is - it is the square root of minus one. There is no other way of writing it! (other than, say, 0.5*sqrt(-4), but that's just being petty.)
Originally posted by ChronicLeakyWhat does the Q mean in your formula? I'd like to try it.
Find the ring of integers in the field Q[x]/(x^2+1), then find a generator for the (multiplicative) group of units in this ring. The real multiples of this generator are the imaginary numbers.
Originally posted by FabianFnasSo, other than a curiosity, or to make fun mathematical puzzles, imaginary numbers have no real use in mathematics?
Try to solve the equation x^2=-1. There are no solution with ordinary numbers but if you introduce a number "i" with the property that i^2 = -1 the equation is solvable.
With the aid of "i" every equation of the form ax^2+bx+c=d is solvable. Even every equation with x^n where n can be any natural number can be solved.
There is a natural blockage for ...[text shortened]... the world of complex numbers involving "i". Mathematics is thereafter one degree funnier.
Originally posted by PinkFloydThey have real value in electronics. I don't know how much basic electricity you have taken but if you have a straight DC circuit, say a battery and a light bulb, if you have a ten volt battery and a light that will draw one amp at ten volts, that represents a ten watt bulb. You just multiply the amps times the volts and you get the power in watts.
So, other than a curiosity, or to make fun mathematical puzzles, imaginary numbers have no real use in mathematics?
Originally posted by PinkFloyd"imaginary numbers have no real use in mathematics?"
So, other than a curiosity, or to make fun mathematical puzzles, imaginary numbers have no real use in mathematics?
Originally posted by FabianFnasNo it was a real question; expecting a sober, non-sarcastic answer.
"imaginary numbers have no real use in mathematics?"
This was intended to be funny, wasn't it? 😀
Real use for imaginary number, or imaginary use for real numbers!
I think there are a lot of areas in mathematics where complex numbers (of the form a+bi) are used. Partly because it helps calculations. Some trig problems are very simple when you kno ...[text shortened]... complex numbers, you cannot do with reals. Like sqrt(-5), ln(-3), etc...
Fun, fun, really!
Originally posted by FabianFnasYou're not the only one to find the wordings fun - maybe it's a nordic thingy then. Personally I can't wait to get to use complex numbers in math, our next course should include that. Too bad we don't get to use complex numbers in physics until in university 🙁
No sarcasm intended. I just thought your wordings was quite humourus. Perhaps I should blame my lack of linguistic skills.