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# the square root of -4?

dunno if ive posted this before, but i thought id do it now jsut for the craic

impossible numbers

24 Comments

Original Poster

numbers like this are actually used in things like mathematical proofs and such like i believe

2i or 2j, depending on what science you're studying...

They aren't impossible, they are just complex.

And they are used in a hell of a lot beyond mathematical proofs...

Edited by: "jah128" 14th Mar 2011

tree to the power of fiddy

Original Poster

jah128

2i or 2j, depending on what science you're studying...And they are used … 2i or 2j, depending on what science you're studying...And they are used in a hell of a lot beyond mathematical proofs...

what the deuce! there isnt actually an answer to the question is there? i thought it was just an impossible number quite simply! youve blown my mind...

i dont really know anything about matematical proofs, are they used in general equations then aswell?

Original Poster

numptyj

tree to the power of fiddy

said the loch ness monster

Its 2i

joeprosho

what the deuce! there isnt actually an answer to the question is there? i … what the deuce! there isnt actually an answer to the question is there? i thought it was just an impossible number quite simply! youve blown my mind... i dont really know anything about matematical proofs, are they used in general equations then aswell?

You almost certainly wouldn't be using a computer now if there wasn't a 'solution'. They are used extensively in engineering (especially electronics) and quantum physics...

it's an "imaginary" number and is used extensively in physics for solving mathematical problems or in equations such as schrodingers equation

It's an imaginary number and its 2i where i is SQRT(-1).

wtf..........this time of night , lol....my brain is on meltdown now and ready for bobo's X)

Original Poster

theres no chance all u people new this without a serious bit of googling or sumthing, in my mind it was as simple as a number cannot be both a positive and a negative end off.

therefor it is an impossible number, but no! you lot had to ruin it.. wish id never posted oO (jkin)

im willing to concede one of you, probably jah128 actually knew about this.. but thats it, well maybe 2i people but no more!

joeprosho

im willing to concede one of you, probably jah128 actually knew about … im willing to concede one of you, probably jah128 actually knew about this.. but thats it maybe 2i people who posted knew about this

To be fair, anyone who studied further maths at A-level, physics or any maths/physics/engineering subject at uni will certainly have dealt with them, they are pretty widely used.

I used google.

joeprosho

theres no chance all u people new this without a serious bit of googling … theres no chance all u people new this without a serious bit of googling or sumthing, in my mind it was as simple as a number cannot be both a positive and a negative end off. therefor it is an impossible number, but no! you lot had to ruin it.. wish id never posted oO (jkin)im willing to concede one of you, probably jah128 actually knew about this.. but thats it, well maybe 2i people but no more!

Seeing as I am doing a Masters in Physics you can concede that I knew it to :p.

bigfoot100

Seeing as I am doing a Masters in Physics you can concede that I knew it … Seeing as I am doing a Masters in Physics you can concede that I knew it to :p.

You mean 'too'

Original Poster

jah128

To be fair, anyone who studied further maths at A-level, physics or any … To be fair, anyone who studied further maths at A-level, physics or any maths/physics/engineering subject at uni will certainly have dealt with them, they are pretty widely used.

hmm i did geography, biology, DT and then Geog environmental consultancy so have managed to avoid them... started with physics at A level but dropped it and certainly dont ever remember comign across them before... i dont like there being an answer though!!... prefer the idea of an impossible number that has to be both negative and positive....

i can concede you knew it too bigfoot, jsut making me feel liek a right dumbass here with all ur answer though lol

mad-diesel

You mean 'too'

Master in physics not english

Original Poster

tbh it still strikes me a little bit as cheating as the letter i is just a symbol for SQRT(-1) from all accounts above, so the answer is like a little mini formula within itself,

that makes me a little more satisfied, i feel i can nearly argue again

wtf !!

Not exactly on topic....but... I'm always very impressed when people talk to each other in mathematical terms. I have no idea as my maths is only O level standard.

I really didn't get the hang of the maths for, for instance, mean free paths, for Chemistry - just had to learn it the best I could; I always thought it was good to be able to describe something far more precisely than in 'language'.

Original Poster

chesso

Not exactly on topic....but... I'm always very impressed when people talk … Not exactly on topic....but... I'm always very impressed when people talk to each other in mathematical terms. I have no idea as my maths is only O level standard. I really didn't get the hang of the maths for, for instance, mean free paths, for Chemistry - just had to learn it the best I could; I always thought it was good to be able to describe something far more precisely than in 'language'.

chesso youve just exploded my brain for the second time tonight... thanks.

hows ur photo thread going btw? i havnt dropped by in a while

joeprosho

[hesso youve just exploded my brain for the second time tonight... … [hesso youve just exploded my brain for the second time tonight... thanks.hows ur photo thread going btw? i havnt dropped by in a while

You're welcome
The thread is good!! The theme for the comp on the 31st is 'Water'. Get snapping.

Im probably wrong, but I like to look at things like this in a simplistic way.

-4 is the same as your friend owing you £4 to buy 2 pints....but when he says he will give you the square root of his debt back (and hands you over an Orange & Mango j20) you respond by giving him 2 shiners in return.

2i

Original Poster

splatsplatsplat

Im probably wrong, but I like to look at things like this in a simplistic … Im probably wrong, but I like to look at things like this in a simplistic way.-4 is the same as your friend owing you £4 to buy 2 pints....but when he says he will give you the square root of his debt back (and hands you over an Orange & Mango j20) you respond by giving him 2 shiners in return.2i

Good effort
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