/sci/ - Science & Math » Thread #13188775

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Anonymous Tue 25 May 22:45:48 2021 No.13188775 View Reply Original Report

Quoted By: >>13188862 >>13188917 >>13189184 >>13191133 >>13191191 >>13191238 >>13191679 >>13191682 >>13191839 >>13192112 >>13192185 >>13192479

Why 2 minus make a plus but two plus don't make a minus

Anonymous

Anonymous Tue 25 May 2021 22:57:26 No.13188828 Report

Quoted By:

contravariant vs covariant

Anonymous

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Anonymous Tue 25 May 2021 22:58:40 No.13188830 Report

Quoted By: >>13189174 >>13191100 >>13191689 >>13192054

This is how my dad explained it to me.

Anonymous

Anonymous Tue 25 May 2021 23:05:19 No.13188862 Report

Quoted By:

>>13188775
one minus is a reversion. The second one is reversing the first. It doesn't work that way with pluses.

Anonymous

Anonymous Tue 25 May 2021 23:16:32 No.13188917 Report

Quoted By:

>>13188775
there's an undiscovered sign, or quantity, to iron out the symmetry

Anonymous

Anonymous Tue 25 May 2021 23:17:43 No.13188921 Report

Quoted By:

it just does

Anonymous

Anonymous Wed 26 May 2021 00:27:37 No.13189171 Report

Quoted By:

Two minuses dont make a plus, counterexample is
-1-1 = -2
Easy

Anonymous

Anonymous Wed 26 May 2021 00:29:01 No.13189174 Report

Quoted By: >>13189193

>>13188830
genius

Anonymous

Anonymous Wed 26 May 2021 00:31:24 No.13189184 Report

Quoted By:

>>13188775
Two minus makes a plus is a retarded way of looking at math and is a way brainlet teachers teach math to brainlet students so they can pass tests.

Anonymous

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Anonymous Wed 26 May 2021 00:33:11 No.13189193 Report

Quoted By:

>>13189174
YEAH! My dad is cool!

Anonymous

Anonymous Wed 26 May 2021 10:37:53 No.13191100 Report

Quoted By: >>13191304

>>13188830
i dont get it

Anonymous

Anonymous Wed 26 May 2021 10:54:37 No.13191133 Report

Quoted By: >>13191753

>>13188775
Practical Example:
I run a logging company. One man can cut down 3 trees in a day. How many trees can I cut if I have 10 men?
10 * 3 = 30
Now I have a capacity of 30 trees per day. What happens if I loose 2 men to sickness?
30 + -2 * 3 = 24
I have a particular kind of unproductive employee who likes to chat to other employees and waste time. When he is working his overall impact is -3 trees to capacity. What happens if I add 2 of these men to the workforce?
24 + 2 * -3 = 18
Now what happens if I remove these two men from the workforce?
18 + -2 * -3 = 24

Anonymous

Anonymous Wed 26 May 2021 11:22:44 No.13191191 Report

Quoted By:

>>13188775
Multiplying by minus is reflecting your position on the real line with respect to zero.
Since there's only 'to the left of zero' and 'to the right of zero' (what about exactly at zero?) whenever you reflect your position twice you get to the same place you were in the beginning.
Multiplying by plus does not involve any reflection.

Anonymous

Anonymous Wed 26 May 2021 11:40:19 No.13191238 Report

Quoted By:

>>13188775
Groups. It follows from the equations for the inverse element.

Anonymous

Anonymous Wed 26 May 2021 11:42:55 No.13191243 Report

Quoted By: >>13191673

2 plus is like 4 minus, so it is plus

Anonymous

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Anonymous Wed 26 May 2021 12:04:12 No.13191304 Report

Quoted By: >>13191331

>>13191100
First rotate the other minus sign 90, then move its centre to the centre of the other one. What you get is a +.

Anonymous

Anonymous Wed 26 May 2021 12:11:31 No.13191331 Report

Quoted By: >>13192101

>>13191304
You are a fucking idiot

Anonymous

Anonymous Wed 26 May 2021 14:08:04 No.13191673 Report

Quoted By:

>>13191243
Best answer so far

Anonymous

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Anonymous Wed 26 May 2021 14:11:13 No.13191679 Report

Quoted By: >>13192009

>>13188775
This isn't /biz/ snibi, what are you doing here?

Anonymous

Anonymous Wed 26 May 2021 14:13:08 No.13191682 Report

Quoted By:

>>13188775
2 minus make bigger minus

Anonymous

Anonymous Wed 26 May 2021 14:15:04 No.13191689 Report

Quoted By: >>13192101

>>13188830
This is retarded

Anonymous

Anonymous Wed 26 May 2021 14:33:43 No.13191753 Report

Quoted By:

>>13191133
based
you can also say that the first minus is dept and the second is undept

Anonymous

Anonymous Wed 26 May 2021 14:59:53 No.13191839 Report

Quoted By:

>>13188775
Two minus is like saying "OP is not not gay", which means he's gay. Two pluses just make OP even gayer.

Anonymous

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Anonymous Wed 26 May 2021 15:39:15 No.13192009 Report

Quoted By:

>>13191679
Because I used to believe buying was the opposite of selling and it was a zero sum game, how naive of me

Anonymous

Anonymous Wed 26 May 2021 15:48:18 No.13192054 Report

Quoted By: >>13192101

>>13188830
This is how it works

Anonymous

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Anonymous Wed 26 May 2021 16:00:21 No.13192101 Report

Quoted By:

>>13191331
no u

>>13191689
Don't say such things about my dad. He's the king!

>>13192054
Yeah, and that's also why ++ isn't a -.

Anonymous

Anonymous Wed 26 May 2021 16:03:17 No.13192112 Report

Quoted By:

>>13188775
Negation is a reflection operator. You map a number to a conjugate pair, such that the original number and the conjugate number add to zero. Two reflections get you back where you started.

Anonymous

Anonymous Wed 26 May 2021 16:16:37 No.13192185 Report

Quoted By:

>>13188775
-1 = 1/-1
-1*-1 = -1 / -1 = 1
a/a = 1
/thread

Anonymous

Anonymous Wed 26 May 2021 16:17:27 No.13192190 Report

Quoted By:

By definition -x is the inverse of x under addition.
In other words, x + (-x) = 0 (the identity element of addition).
There are two binary operations acting on the real numbers: addition (+) and multiplication (*).
They are both commutative, associative, etc. and they interact like this: a * (b + c) = a * b + a * c.

Here's a proof that "negative times negative equals positive":
Consider the expression (-1) * (-1)
(-1) * (-1) = 0 + (-1) * (-1) = ((-1) + 1) + (-1) * (-1) = 1 + (-1)(1 + (-1)) = 1
Now consider the more general expression (-x) * (-y) for arbitrary, positive real numbers x and y.
We have that (-x) * (-y) = (-1) * x * (-1) * y = (-1) * (-1) * x * y = 1 * x * y = x * y. which is positive.

Anonymous

Anonymous Wed 26 May 2021 17:36:33 No.13192479 Report

Quoted By:

>>13188775
>the synonym of opposite is opposite
>the synonym of synonym is synonym
>the opposite of synonym is synonym
>the opposite of opposite is synonym
get it now?

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