Comment on multiplication alignment chart

Ephera@lemmy.ml ⁨4⁩ ⁨days⁩ ago

• Sivecano@lemmy.dbzer0.com ⁨2⁩ ⁨days⁩ ago

  You know the top left one. They teach that in schools.

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  • Ephera@lemmy.ml ⁨1⁩ ⁨day⁩ ago

    I mean, yeah, I studied computer science. Presumably, I’ve been taught the majority of these at some point. I just absolutely fucking hate mathematical notation.

    Due to your comment, I’m guessing, top-left is multiplication then, even though I was also taught in school to use × for multiplication.
    Top-center might be logical AND? Top-right might be function composition? Center-left and center-right might be ranges, unless those dots indicate multiplication, then no fucking clue. Bottom left is set intersection. And one of these circles or crosses is probably the Cartesian product.

    So, I mean, I do know some of this shit. In truth, I was just deriding mathematical notation with that meme, because well, “Set” is the only actual word in all that mathematical notation… 😵‍💫

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    • Sivecano@lemmy.dbzer0.com ⁨1⁩ ⁨day⁩ ago

      yeah, top-left is regular multiplication. Top-center actjally is the so-called alternating product (basically the correct way of defining the cross product).

      Top-right is supposed to be the operation in a gtoup.

      There’s no explicit cartesian product here but the middle one is the tensor product. The tensor prodict of sets (in so far as that statement makes sense) is the cartesian product.

      :)

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