• 2 Posts
  • 18 Comments
Joined 3 years ago
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Cake day: July 13th, 2023

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  • 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.


  • Not really much, tbh.

    Decent quality door locks
    Clear line of sight from the street to likely entry points
    Loud alarms so if they do break in they’re not likely to stay long

    If someone wants to get into a house, there isn’t much you can do to stop them unless you’re rich and can afford exotic shit like bullet proof glass windows and thick metal reinforced doors.
    All to can really do is discourage crimes of opportunity by making them seem like bad opportunities.





  • 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





  • Wikipedia

    In mathematics and computer programming, the order of operations is a collection of conventions about which arithmetic operations to perform first in order to evaluate a given mathematical expression

    What’s that? You don’t trust Wikipedia?
    Ok, you’ve yet to explain why notations like prefix and postfix dont need these “rules”.
    If they were rules of mathematics **itself** how could they only apply to certain notations?





  • Ok, then explain prefix and postfix, where these conventions don’t apply. How can these be rules of math when they didn’t universally apply?

    Says someone who didn’t rearrange "PEMDAS

    The order of operations tells us how to interpret an equation without rearranging it. When you pick a different convention, you need to rearrange it to get the same answer. What you did was rearrange the equation, which you can only do if you are already following a specific convention.

    No it can’t because no it wouldn’t 😂

    All conventions can produce the correct answer, when appropriately arranged for that convention, because the conventions are not laws of mathematics, they are conventions.

    Nope! The obey all the rules of Maths. They would get wrong answers if they didn’t

    They obey the laws of math. Conventions aren’t laws of math, they’re conventions. And a quick Google search will tell you that not everyone puts juxtaposition at a higher precedent than multiplication; it’s a convention. As long as people are using the same convention, they’ll agree on an answer and that answer is correct.

    You can be mean all you like, that doesn’t change the nature of conventions


  • That’s not true Here is an example:
    8÷2x4
    PEMDAS: 8÷2x4 = 8÷8 = 1
    PEDMAS: 8÷2x4 = 4x4 = 16
    PE M|D A|S: 8÷2x4 = 4x4 = 16
    And thats not even getting into juxtaposition operations, where fields like physics use conventions that differ from most other field.

    but you’re missing the point. It could be SAMDEP and math would still work, you’d just rearrange the equation. Just like with prefix or postfix notation. The rules don’t change, just the notation conventions change. But you need to agree on the notation conventions to reach the same answer.



  • PeriodicallyPedantic@lemmy.catomemes@lemmy.worldMath is not a democracy
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    26 days ago

    If you look at the arguments on math forums, you’ll see that there isn’t just one rule.

    It is a convention, and different places teach different conventions.
    Namely, some places say that PEDMAS is a very strict order. Other places say that it is PE D|M A|S, where D and M are the same level and order is left-to-right, and same with addition vs subtraction.
    And others, even in this post, say it’s PEMDAS, which I have heard before.

    “Correct” and “incorrect” don’t apply to conventions, it’s simply a matter of if the people talking agree on the convention to use. And there are clearly at least three that highly educated people use and can’t agree on.