Math Memes

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Memes related to mathematics.

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1: Memes must be related to mathematics in some way.
2: No bigotry of any kind.

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WTF 🤦 (sh.itjust.works)

submitted 9 months ago by 0x4E4F@sh.itjust.works to c/mathmemes@lemmy.blahaj.zone

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[–] 0x4E4F@sh.itjust.works 3 points 9 months ago (1 children)

√4=+-2

[–] rasensprenger@feddit.de 3 points 9 months ago* (last edited 9 months ago) (2 children)

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 9 months ago (1 children)

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 9 months ago

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

[–] 0x4E4F@sh.itjust.works 2 points 9 months ago* (last edited 9 months ago)

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