Comment on A fake Facebook event disguised as a math problem has been one of its top posts for 6 months

• SmartmanApps@programming.dev ⁨15⁩ ⁨hours⁩ ago

  It is though. Here’s a link to buy a printed copy:

  BWAHAHAHAHAHAHA! They print it out when someone places an order! 😂

  You keep mentioning textbooks but haven’t actually shown any that support you. I have

  No you haven’t. You’ve shown 2 websites, both updated by random people.

  I’ll trust the PhD teaching a university course on the subject

  I already pointed out to you that they DON’T teach order of operations at University. It’s taught in high school. Dude on page you referred to was teaching Set theory, not order of operations.

  over the nobody on the internet

  Don’t know who you’re referring to. I’m a high school Maths teacher, hence the dozens of textbooks on the topic.

  Talking about yourself in the third person is weird

  Proves I’m not weird then doesn’t it.

  Even your nonsense about a silent “+”

  You call what’s in textbooks nonsense? That explains a lot! 😂

  Image

  is really just leaving off the leading 0 in the equation 0+2

  And yet the textbook says nothing of the kind.

  Because addition is a binary operator

  No it isn’t 😂

  Only the ones that operate on two inputs.

  Now you’re getting it. Multiply and divide take 2 inputs, add and subtract take 1.

  Some examples of unary operators are factorial, absolute value, and trig functions.

  Actually none of those are operators. The first 2 are grouping symbols (like brackets, exponents, and vinculums), the last is a function (it was right there in the name). The only unary operators are plus and minus.

  I can’t keep trying to explain the same thing to you

  You very nearly got it that time though! 😂

  at least less wrong

  Again, it’s not me who’s wrong.

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  • AbidanYre@lemmy.world ⁨14⁩ ⁨hours⁩ ago

    They print it out when someone places an order! 😂

    Welcome to the 21st century. We have this thing called the internet so people can share information without killing trees. It’s the resource material for a college course. That’s like the definition of a text book without costing the students a month’s rent.

    random people.

    One is a PhD teaching a college course on the subject, the other is Wolfram. Neither of those are “random people” and I’m willing to bet their credentials beat “claims to be a high school math teacher” pretty soundly.

    I already pointed out to you that they DON’T teach order of operations at University. It’s taught in high school. Dude on page you referred to was teaching Set theory, not order of operations.

    This portion of the discussion wasn’t about order of operations, it was about the number of inputs an operator (+, and - in this case) has. Try to keep up.

    Don’t know who you’re referring to. I’m a high school Maths teacher, hence the dozens of textbooks on the topic.

    Dear God if that’s true I feel sorry for your students and embarrassed for whatever school is paying you. But this is the internet and with any luck that’s a flat out lie. But at least your repeated use of the plural maths means you’re not anywhere near my kids.

    And yet the textbook says nothing of the kind. If I had 2+3, which is really +2+3…

    Oh, I see the problem. We’re back to reading comprehension. That section you highlighted specifically refers to when those symbols are being used as a “sign of the quality” of the number it’s referring to, not when it’s being used to indicate an operation like addition or subtraction. Hopefully that clears it up. This is ignoring the fact that a random screen shot could be anything. For all I know you wrote that yourself.

    do I, according to you, have to write 0+2+0+3

    No. You also don’t need to write +2+3 because the first “+” isn’t an operator. It’s, as your own picture says, a sign of the quality of 2.

    Now you’re getting it. Multiply and divide take 2 inputs, add and subtract take 1.

    I would love to know how you get to a sum or difference with only one input. Here, I’ll try to spell it out using your own example so that even you can understand.

    The inputs to 2 + 3 = 5 are 2 and 3. Let’s count them together. 2 is the first, and 3 is the second. 1, 2. Two inputs for addition. Did you get it this time? Was that too fast? You can go back and read it again if you need to

    Actually none of those are operators. The first 2 are grouping symbols

    Fine, operation then. The fact that you think “!” is the same thing as brackets doesn’t do anything to help your bona fides. And I don’t have the energy to write up a word doc and screen shot it since that’s apparently what it takes for you to consider something valid.

    Maybe you’re just being weirdly pedantic about operator vs operation. Which would be a strange hill to die on since the original topic was operations.

    You very nearly got it that time though! 😂

    If by “it” you mean through your thick skull, then you’re more optimistic than I am.

    Again, it’s not me who’s wrong.

    Again, it is. I could keep providing sources, but I still don’t have the time to screen shot some random crap with no supporting evidence.

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    • SmartmanApps@programming.dev ⁨13⁩ ⁨hours⁩ ago

      Welcome to the 21st century

      Welcome to it’s not a textbook (and it wasn’t about order of operations anyway).

      We have this thing called the internet so people can share information without killing trees

      We also have this thing called textbooks, that schools order so that Maths classes don’t have to be held in computer labs.

      It’s the resource material for a college course

      And the college doesn’t teach order of operations.

      That’s like the definition of a text book

      by someone who can’t back up their statements with actual textbooks.

      One is a PhD teaching a college course on the subject

      Yep, exactly what I said - a random person as far as order of operations is concerned, since he teaches Set Theory and not order of operations.

      the other is Wolfram

      Yeah, their programmers didn’t know The Distributive Law either.

      I’m willing to bet their credentials beat “claims to be a high school math teacher” pretty soundly

      Happy to take that bet. Guarantee you neither of them has studied order of operations since they were in high school.

      This portion of the discussion wasn’t about order of operations

      Yes it is. I said that order of operations dictates that you have to solve binary operators before unary operators, then you started trying to argue about unary operators.

      it was about the number of inputs an operator (+, and - in this case) has

      Yep, the ones with more inputs, binary operators, have to be solved first.

      Try to keep up

      Says person who’s forgotten why we were talking about it to begin with! 😂

      At least your repeated use of the plural maths means you’re not anywhere near my kids.

      Well that outs yourself as living in a country which has fallen behind the rest of the world in Maths, where high school teachers don’t even have to have Maths qualifications to teach Maths.

      when those symbols are being used as a “sign of the quality” of the number it’s referring to

      which is always. As usual, the comprehension issue is at your end.

      not when it’s being used to indicate an operation like addition or subtraction

      Yes it is 😂

      Hopefully that clears it up

      That you still have comprehension issues? I knew that already

      This is ignoring the fact that a random screen shot could be anything

      The name of the book is in the top left. Not very observant either.

      For all I know you wrote that yourself

      You don’t care how much you embarrass yourself do you, given the name of the book is in the top left and anyone can find and download it. 😂

      because the first “+” isn’t an operator

      Yes it is! 😂

      It’s, as your own picture says, a sign of the quality of 2

      and a sign of the quality of the 3 too. There are 2 of them, one for each Term, since it’s a 1:1 relationship.

      I would love to know how you get to a sum or difference with only one input.

      You don’t. Both need 2 Terms with signs. In this case +2 and +3.

      2 is the first, and 3 is the second

      Yep, corresponding to the 2 plus signs, +2 and +3. 1 unary operator, 1 Term, 2 of each.

      Two inputs for addition

      2 jumps on the number line, starting from 0, +2, then +3, ends up at +5 on the number line. This is how it’s taught in elementary school.

      Did you get it this time?

      The real question is did you?

      Was that too fast?

      No, you just forgot one of the plus signs in your counting, the one we usually omit by convention if at the start of the expression (whereas we never omit a minus sign if it’s at the start of the expression).

      You can go back and read it again if you need to

      I’m not the one who doesn’t know how unary operators work. Try it again, this time not leaving out the first plus sign.

      Fine, operation then

      Nope, not an operation either.

      The fact that you think “!” is the same thing as brackets

      I see you don’t know how grouping symbols work either.

      Maybe you’re just being weirdly pedantic about operator vs operation

      Grouping symbols are neither.

      Which would be a strange hill to die on since the original topic was operations

      You were the one who incorrectly brought grouping symbols into it, not me.

      I could keep providing sources

      You haven’t provided any yet! 😂

      I still don’t have the time to screen shot some random crap with no supporting evidence

      Glad you finally admitted you have no supporting evidence. Bye then! 😂

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