/sci/ - Science & Math

>engineering
not science or math

>>9671977
Wait, why would you make it negative on the second line? The absolute value is always positive??

>>9671989
imagine affirmative action

>>9671989
bait

___
|x| = \/x^2

>>9671990
Not sure what my race has to do with this, but yes I am black. So what? I never understand when people say that I am no good in math. I am VERY well done in math. I am very well done in science, and I have an associates math degree. Also, I have a better job than you do I bet (68,000 per year).

>>9671989
|-8| = --8 = 8

>>9671989
>>9672009
BAIT
>BAIT
BAIT
>BAIT
BAIT
>BAIT
BAIT
>BAIT

>>9672000
>>9672013

>>9671977
What about x=0? Into the trash it goes...

>>9671989
2/10 got me to respond
[math]f(x) = |x| [/math]

>>9672050
This. The top line should be x for x>= 0.

>>9671977
now calculate the derivative of this function.

>>9671989
kys

>>9672625
No. The bottom line should be -x if <= 0
you hyperbrainlet

>>9672628
1 when x>0
-1 when x<0
undefined everywhere else so ofc no derivative

>>9672660
try using the differential formula faggot

>>9672666
derivative*

>>9672666
>>9672668
for a polynomial function ax^n the derivative is anx^(n-1)

https://en.wikipedia.org/wiki/Weak_derivative
Why are nu-math faggots so afraid of PDEs?

>>9672657
>-0

>>9672686
you can define it with a more simple term
once again try plugging in |x| into the difference quotient

>>9672693
-0 = 0

>>9672694
for x>0
((x + h) - x)/h = 1
for x<0
(-(x + h) + x)/h = -1

>>9672727
>two definitions for specific ranges
stop being retarded pls

>>9672732
I'll fucking end you.
Give me your address I will drive down there and beat your ass in kid.

>>9672660
Wrong, it's easily defined by die heaviside step function at zero.

Stop thinking like a mathematician brainlet.

>>9672740
H(0) = 1/2 you fucking little shit

>>9672752
Have you heard of coefficients you little 2nd grade shit?

>>9672754
no u

>>9671977
>|0| is undefined
nice definition m9

>>9672722
=0^0

>>9672760
>>9672754
>>9672752
>>9672740
>>9672738
>all these retards
jesus guys
y=sqrt(x^2)/x
see it wasnt that hard

>>9672722
= 0^0

>>967272>0 = -0

>>9672722
>0 = -0

>>9672787
>>9672772
>>9672771
(you)

>>9672822
y=sqrt(x^2)/x is right tho retard it isnt defined for 0 as well

>>9672825
-2^2=4
sqrt(4)=2
2/2=1.
abs(-2)=1???????

>>9672740
Also you can't use this because OP invalidated that part of the textbook

>>9672833
its 2/-2 not 2/2 brainlet

>>9672848
I-I'm sorry creampai. Will you forgive me?

>>9671977
>|0| is undefined

>>9671989 >>9672018
>[math] -(-x) \neq |x| [/math]

>>9672787
>[math] -0 \neq 0 [/math]

>>9672861
>>9672657
|x| = -x if x <=0
|0| = -0

what the fuck don't you brainlets understand about this.

>>9672874
the superior notation is sqrt(x^2) anyway

wtf is this thread

[math]
\frac{d}{dx}|x|=x\cdot \textrm{sgn}(x)
[/math]

>>9673582
>x*sgn
>tfw you cant even derivate one of the most simple functions correctly

>>9672009
too obvious

>>9672876
The superior notation is max(x,-x).
Brainlet.

>>9671977
Only if x is a real number. The norm isnt to simple, brainlet

>>9671977
The cardinality of x is not the same as its value.

>>9672050
We don't care about measure 0 sets

>>9672622
That graph is showing the value Y in Y=f(|x|) for given x values, but OP image is simply talking about the value of |x|, it gives no indication its being used in a function, completely different things.

>>9675651
fair enough, op's image is a bit misleading, here's the correct way to say it

>>9674248
>he doesn't use an arbitrary metric

>>9672874
the top one is claiming that ops image implies |0| is undefined

>>9671990
>>9672018
>>9672666
>>9672693
>>9672787
>>9672861
sides gone

>>9675765
>>−(−x)≠|x|
This is true for x < 0

wait |-9| is 9
why would the text describe what -|-9| is supposed to be

math is a meme

>>9676944
|-9| = -(-9) since -9 < 0

>>9676949
but absolute value of -9 is 9

am I being rolled here

>>9676956
-(-9) is 9

>>9676956
graph the equation in OP's pic and it might make more sense why the equations are set up the way they are

>>9676956
But steel is heavier than feathers

>>9675413
Analysisfags need to get out

he's talking about logs you retards

>>9677494
I don't understand spoon feed me

>>9671985
at least it's some real stuff instead of some gay imaginary numbers

>>9675383
|x| tells you the number's distance from 0. OP's picture is only correct if you're dealing with R. If you are dealing with C then you would use the pythagorean theorem.

>>9672787
this image should be banned on this board. thats the graph of the function [math]f(x) = -\dfrac{1}{x^2} [/math], not the limit. used by all of 4chan because "more math symbols" means "more smarter." although its kind of relevant in this case since that lim = 0 = -0

>>9675383
>the cardinality of x

???????????????????????????????????????

>>9672009
>race
No such thing.

>>9679323
>race
>No such thing.

>>9671977
The absolute value is the distance between zero and the number on the number line.

The absolute value is always positive or zero, never negative.

>>9672009
Weak bait