• PeriodicallyPedantic@lemmy.ca
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      17 days ago

      To a “maths teacher”

      Yeah sure
      A “teacher” who doesn’t know that all lessons are simplifications that get corrected at a higher level, and confidentiality refers to children’s textbook as an infallible source of college level information.

      A “teacher” incapable of differentiating between rules of a convention and the laws of mathematics.

      A “teacher” incapable of looking up information on notations of their own specialization, and synthesizing it into coherent response.

      Uh huh, sounds totally legit

      • FishFace@piefed.social
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        17 days ago

        Don’t bother mate. Even if you corner them on something, they absolutely will not budge.

        I like many others brought up calculators and how common basic calculators only evaluate from left to right. They contend that this is not true and that calculators have always been able to obey order of operations. I even linked the manuals of two different calculators which both had this operation.

        He asserted (without evidence) that the first does not operate in this way (even though the manual says that you must re-order some expressions so that bracketed sub-expressions come first). He then characterised the second as a “chain calculator” for “niche purposes”. So he admits it works left-to-right, but still will not admit that he was wrong about his claim.

        This calculator thing is not central to the discussion on order of operations, but it goes to show: you will not convince him of anything no matter what the evidence is.

        By the way, after reading a few of his comments, I believe I can summarise his whackadoodle understanding if you want to continue tilting at windmills: he fundamentally cannot separate mathematics from the notation. Thus he distinguishes many things which are the same but which are written differently.

        • He calls a×b multiplication and ab a product. These are, of course, the exact same thing. Within a mathematical expression, the implicit multiplication in ab can, by some conventions, have a higher precedence than does the explicit multiplication in a×b, and he has taken that to mean that they are fundamentally different.
        • He thinks that a(b+c)=ab+bc is something to do with notation, not a fundamental relationship between multiplication and addition. (This is not a difference for him though). This he calls the “distributive law” which he distinguishes from the “distributive property” (I will say that no author would distinguish those two terms, because they’re just too easily confused. And many authors explicitly say that one is also known as the other). He says that a×(b+c) = ab + bc is an instance of the “distributive property”.
      • A “teacher” who doesn’t know that all lessons are simplifications that get corrected at a higher level,

        As opposed to a Maths teacher who knows there are no corrections made at a higher level. Go ahead and look for a Maths textbook which includes one of these mysterious “corrections” that you refer to - I’ll wait 😂

        refers to children’s textbook as an infallible source of college level information

        A high school Maths textbook most certainly is an infallible source of “college level” information, given it contains the exact same rules 😂

        A “teacher” incapable of differentiating between rules of a convention and the laws of mathematics

        Well, that’s you! 😂 The one who quoted Wikipedia and not a Maths textbook 😂

        A “teacher” incapable of looking up information on notations of their own specialization

        You again 😂 Wikipedia isn’t a Maths textbook

        • PeriodicallyPedantic@lemmy.ca
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          17 days ago

          Man, this whole post has been embarrassing for you. Oof.

          I can’t help but notice youve once again failed to address prefix and postfix notations.
          And that you’ve not actually made any argument other than “nuh uh”
          Not to mention the other threads you’ve been in. Yikes.

          We can all tell you’re not a maths teacher.

          • Man, this whole post has been embarrassing for you

            Nope. I’m the only one who has backed up what they’ve said with Maths textbooks 🙄

            I can’t help but notice youve once again failed to address prefix and postfix notations.

            What is it that you want addressed?

            And that you’ve not actually made any argument other than “nuh uh”

            Backed up by Maths textbooks 🙄

            We can all tell you’re not a maths teacher

            Says person who actually isn’t a Maths teacher, hence no textbooks 😂

            • PeriodicallyPedantic@lemmy.ca
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              15 days ago

              Your argument you haven’t made is backed up by math textbooks you haven’t provided written for children.

              What is it that you want addressed?

              How can that specific order of operations be a law of mathematics if it only applies to infix notation, and not prefix or postfix notations? Laws of mathematics are universal across notations.

              Show me a textbook that discusses other notations and also says that order of operations is a law of mathematics.
              You don’t have it, and you also aren’t a maths teacher, or a teacher at all. Just because you say it a lot doesn’t make it true.

              • Your argument you haven’t made is backed up by math textbooks you haven’t provided written for children

                That’s quite a word salad. You wanna try that again, but make sense this time?

                Your argument you haven’t made

                If I didn’t make it then it’s not my argument, it’s somebody else’s 😂

                is backed up by math textbooks you haven’t provided

                as well as the textbooks I have provided 😂

                written for children

                All my textbooks are for teenagers and adults

                How can that specific order of operations be a law of mathematics if it only applies to infix notation, and not prefix or postfix notations

                I already addressed that here. I knew you were making up that I hadn’t addressed something 🙄

                Laws of mathematics are universal across notations

                Correct, they do.

                also says that order of operations is a law of mathematics.

                If you think it’s not a Law, then all you have to do is give an example which proves it isn’t. I’ll wait

                You don’t have it

                You mean you don’t have a counter-example which proves it’s not a Law

                you also aren’t a maths teacher

                says liar

                Just because you say it a lot doesn’t make it true.

                You know you just saying it’s not true doesn’t make it not true, right? 🤣🤣🤣

                BTW, going back to when you said

                8÷2x4 PEMDAS: 8÷2x4 = 8÷8 = 1

                Here it is from a textbook I came across this week which proves I was right that you did it wrong 😂

                Therefore, doing Multiplication first for 8÷2x4 is {(8x4)÷2}, not 8÷(2x4) - whatever you want to do first, you write first - exactly as I told you to begin with 🙄

                • PeriodicallyPedantic@lemmy.ca
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                  10 hours ago

                  In your screenshot of a textbook, they refer to it as a convention twice.

                  And you still haven’t explained prefix or postfix notation not having order of operations.

                  Get rekd idiot

                  • In your screenshot of a textbook, they refer to it as a convention twice

                    Left to right is a convention, yes, doing Multiplication and Division before Addition and Subtraction is a rule 🙄

                    And you still haven’t explained prefix or postfix notation not having order of operations

                    For the 3rd time it does have order of operations 🙄 You just do them in some random order do you? No wonder you don’t know how Maths works

                    Get rekd idiot

                    says person who doesn’t know the difference between conventions and rules, and thinks postfix notation doesn’t have rules 🙄