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submitted 10 months ago by 0x4E4F@sh.itjust.works to c/mathmemes

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[-] rasensprenger@feddit.de 3 points 10 months ago* (last edited 10 months ago)

The square root of x is usually defined as the positive real number that squares to x, so x^2 = 4 => x = +-2 but sqrt(4) = 2, not +-2

The complex sqrt function is multivalued, but that opens a whole other can of worms

[-] digdug@kbin.social 6 points 10 months ago

And even if you allowed sqrt(4) = ±2, it would still be invalid to evaluate it to -2 on one side of the equation, but then use +2 on the other side.

[-] 0x4E4F@sh.itjust.works 1 points 10 months ago

Of course, you can only choose one at a time, not mix and match, lol 😂.

[-] 0x4E4F@sh.itjust.works 2 points 10 months ago* (last edited 10 months ago)

Oh yeah, you're right, now I remembered 🤦. Been a while 😂, almost 20 years.

this post was submitted on 22 Jan 2024

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Math Memes

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