/sci/ - Science & Math

i doesn't exist it can't exist because it's imaginary. you are a schizo for believing in an imaginary number.

>>11118008
>>a number squared must always be positive
You mean any real number, not just "a number".

>>11118008
>a number squared must always be positive
who said this?

>>11118027
i doesn't exist because it's not real and it can't exist because it's imaginary. you are a schizo for believing in an imaginary number.

>>11118024
anybody who responds to (You) after this post has taken the bait

>>11118008
>a number squared must always be positive
both 5^2 and (-5)^2 are 25 so no.
>i squared is negative 1
it's √2/2(1+i)

>>11118038
After you square a number the result must always be positive.
5^2 is 25 and -5^2 is 25 and 25 is positive in both cases. So i doesn't exist.

>another highschooler doesn't understand complex numbers thread
board really is going to shit

>>11118046
i doesn't exist it can't exist because it's imaginary. you are a schizo for believing in an imaginary number. Take your meds.

>>11118042
i learned math not in English but in my mother language so I got confused about the expression "squared"
however think about multiplying with -1. That's like changing the number's "direction" to its opposite, like rotating it 180 degrees. What if you broke that process down into 2 phases, by rotating it 90 degrees twice? you need a number that when multiplied by itself is -1. that's i. which by itself is like 1 except its direction is at 90 degrees angle relative real numbers.

>>11118085
>relative real numbers.
*relative to

>>11118042
>After you square a number the result must always be positive
Cite this for us.

>>11118085
If you could do that then there would be infinite directions of numbers.

>>11118094
quite. [math]z=re^{i\theta}[/math], [math]\theta\in \text{arg}(z)[/math], [math]r=|z|[/math].

>>11118092
Because there are only two types of numbers positive negative and zero and if you square a number it must always be positive because of math laws say so

>>11118100
So are there infinite directions of numbers? Why did you post that chickenscratch vomit if you knew it was not in my language? SPeak engliESH

>>11118101
>if you square a number it must always be positive because of math laws say so
Give me the textbook and page number where it says this

>>11118101
>only two types
>positive, negative, and zero
lmao

>>11118104
if you don't understand what is written you obviously haven't learned enough about complex numbers to be able to have a reasonable discussion on the matter. read a book

>>11118114
Zero is positive.
>>11118117
Just translate it into english I'm not going to learn to speak Mandarin just so I can read your posts. THe language of communication is english not mandarin so stop speaking chinese dude.

>>11118111
There are thousands of textbooks that say that dude.

>>11118126
>Zero is positive

>>11118127
Of course zero is positive idiot. It's not negative, so it must be positive.

If you add 0 to 1 it doesn't decrease which means it's positive. You're pathetically stupid dude.

If you mutliply 1 by a number it's that number and 0 has a similar ability which makes 0 and 1 related dude.

>>11118126
I'm not going to water it down anymore than it already is faggot, go open a complex analysis book and read the first fucking chapter. pathetic highschool drone.

>>11118135
>https://www.mathsisfun.com/numbers/zero.html
>Zero is neither negative nor positive.

>>11118159
according to some dumb website sure
>>11118154
>read
I'm illiterate I can't read or write.

>>11118176
okay! here's another
https://wiki.kidzsearch.com/wiki/Negative_number
>The number zero is neither positive nor negative

>>11118188
0 is positive though

>>11118126
>There are thousands of textbooks that say that dude.
Nice reference dude :^)

>>11118193
i gave you thousands of references dude

>>11118191
>everybody else is wrong, not me!
https://www.eduplace.com/math/mathsteps/7/b/index.html
>Zero is neither negative nor positive

>>11118218
dude zero is positive infinity is negative and positive numbers are neutral get learned

>>11118204
>i gave you thousands of references dude
Cool, pick one and I'll even look up the page for you.

>>11118233
https://www.youtube.com/watch?v=47wjId9k2Hs
-1*-1 = 1
So, that means, that 1 = -1*1 right?
which also means that i * i = -1
So 1 = i*i*1
So i = 1

>>11118233
Also that means that:

-1*-1 = 1
so
i*i = -1
so
i*i*i*i = 1

So i = 1.

Checkmate.

-1 = i * i.
1 = -1 * -1.
Therefore,
1 = i*i*i*i.
Therefore.
i = 1.
Checkmate losers.

>only in that context
The value of i changes depending on the context? I thought it was a constant?

-1*-1 = 1 <=/=> 1 = -1*1

I know you are trolling but you have to try harder. Also that video by Sal still fails to mention which type of number he is referring to. The "rule" you are looking for is that real numbers, when squared, produce positive values. The imaginary unit i, which is a complex number, does not following this rule as multiplication is not defined the same way for complex numbers as it is for reals.

>>11118008
>he believes in imaginary numbers