Comic Strips

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Comic Strips is a community for those who love comic stories.

The rules are simple:

The post can be a single image, an image gallery, or a link to a specific comic hosted on another site (the author's website, for instance).
The comic must be a complete story.
If it is an external link, it must be to a specific story, not to the root of the site.
You may post comics from others or your own.
If you are posting a comic of your own, a maximum of one per week is allowed (I know, your comics are great, but this rule helps avoid spam).
The comic can be in any language, but if it's not in English, OP must include an English translation in the post's 'body' field (note: you don't need to select a specific language when posting a comic).
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submitted 2 weeks ago by Zpk1a@lemmy.world to c/comicstrips@lemmy.world

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[–] TechieDamien@lemmy.ml 32 points 2 weeks ago (2 children)

Don't know why you are being down voted. You are correct. There is a difference between a square root and the solutions of x^2^ = n.

[–] Acters@lemmy.world 12 points 2 weeks ago

Yeah, square root implies absolute numbers. You need to manually multiply by -1 to get the other solution to x^2

[–] CommanderCloon@lemmy.ml 7 points 2 weeks ago* (last edited 2 weeks ago) (2 children)

No?

In mathematics, a square root of a number x is a number y such that y² = x; in other words, a number y whose square (the result of multiplying the number by itself, or y ⋅ y) is x. For example, 4 and −4 are square roots of 16 because 4² = ( − 4 )² = 16.

Wikipedia

Edit: I'm wrong lol, there is a difference between the square root function, which accepts two results, and the square root, or principal square root, which is a unique positive number

[–] Opisek@lemmy.world 25 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

So close yet so far. If only you had read ONE more paragraph.

Every nonnegative real number x has a unique nonnegative square root, called the principal square root or simply the square root (with a definite article, see below), which is denoted by √x where the symbol "√" is called the radical sign or radix.

[–] CommanderCloon@lemmy.ml 2 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

This sentence made no sense to me as it directly contradicted the previous one. But it's just a confusion on my part between the function called square root, which confusingly outputs two different numbers called "square roots", and "the" number called square root; I've edited my comment. Thanks for correcting me!

[–] Opisek@lemmy.world 2 points 2 weeks ago

Yeah, I see how that can happen. Very confusing to have the same name for two things differentiated only by the use of a definite or indefinite article.

[–] wdx@feddit.org 2 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

Look at the inverse of the square root function, f(x)=x² (https://www.desmos.com/calculator/2v5gzbhru8)

You can get the sqrt of a given y by looking at the x axis. E.g. the value of y=4 has two solutions, x=2 and x=-2. This however does not mean that the sqrt of -4 is also 2! If you look at graph you can see that there are no solutions for y less than 0.

sqrt(-1) , sqrt(-2) (i ill omit imaginary numbers here) and so on do not have a solution. There is nothing you can replace with such that x × x is < 0 because multiplying two negatives always nets a positive.

[–] DragonTypeWyvern@midwest.social 1 points 2 weeks ago

I really don't like the sqrt shorthand.

They knew.