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Biology OP (mander.xyz)

submitted 8 months ago* (last edited 8 months ago) by [email protected] to c/[email protected]

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[–] [email protected] 7 points 8 months ago (2 children)

a/b is the unique solution x to a = bx, if a solution exists. This definition is used for integers, rationals, real and complex numbers.

Defining a/b as a * (1/b) makes sense if you're learning arithmetic, but logically it's more contrived as you then need to define 1/b as the unique solution x to bx = 1, if one exists, which is essentially the first definition.

[–] [email protected] 4 points 8 months ago (2 children)

That's me, a degree-holding full time computer scientist, just learning arithmetic I guess.

Bonus question: what even is subtraction? I'm 99% sure it doesn't exist since I've never used it, I only ever use addition.

[–] [email protected] 3 points 8 months ago (1 children)

Addition by the additive inverse.

[–] [email protected] 1 points 8 months ago (1 children)

Now you just replaced one incalculable thing with a different incalculable thing.

[–] [email protected] 1 points 8 months ago (1 children)

Eh?

[–] [email protected] 2 points 8 months ago (1 children)

Computers don't subtract, and you can't just add a negative, a computer can't interpret a negative number, it can only store a flag that the number is negative. You need to use a couple addition tricks to subtract to numbers to ensure that the computer only has to add. It's addition all the way down.

[–] [email protected] 1 points 8 months ago

What does this have to do with computers?

[–] [email protected] 1 points 8 months ago* (last edited 8 months ago)

what even is subtraction?

It's just addition wearing a trench coat, fake beard and glasses

[–] [email protected] 0 points 8 months ago* (last edited 8 months ago)

Defining a/b as a * (1/b) makes sense if you’re learning arithmetic

The example was just to illustrate the idea not to define division exactly like that