• Kalash ( theKalash@feddit.ch ) 
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      3 years ago

      I agree that pemdas is a bad acronym for teaching exactly because it can be misunderstood as multiplication coming before division and addition coming before substraction, when it’s not the case.

      Luckily we don’t have that acronym where I grew up. We learned “dot before line” (as our division and multiplication symbols involve dots while the addition and substraction symbols only involve lines).

      • Umbrias ( Umbrias@beehaw.org ) 
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        3 years ago

        However as I demonstrated an order of operations in which mult is before div is valid.

        In this case your dot before line still would result in the above expression being ambiguous, as well.

        • Kalash ( theKalash@feddit.ch ) 
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          3 years ago

          However as I demonstrated an order of operations in which mult is before div is valid.

          You didn’t demonstrated that and it’s not.

          In this case your dot before line still would result in the above expression being ambiguous, as well.

          We are also taught left to right, so no.

          • Umbrias ( Umbrias@beehaw.org ) 
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            3 years ago

            Dpemas would be a fully valid mathematical order of operations. As would only left to right. Or right to left. Or only parenthesis.

            The ambiguity remains due to the ambiguity of division operators in single line phrasing and implied multiplication, not because of the shape of the operator lol

            • Kalash ( theKalash@feddit.ch ) 
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              3 years ago

              Dpemas would be a fully valid mathematical order of operations

              Sure, if everyone on the world would switch over and accept that as the offical order of operations, it would be valid. But that’s not the case.

              So either learn the order everyone else uses … or be wrong.

              • Umbrias ( Umbrias@beehaw.org ) 
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                3 years ago

                That’s not what mathematically valid requires.

                You in fact likely have interacted with non pemdas or dot before line orders of ops before. Many calculators in fact follow left to right. Many programming language follow their own unique OoO.

                I don’t think you understand what wrong means.

                • Kalash ( theKalash@feddit.ch ) 
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                  3 years ago

                  Many calculators in fact follow left to right

                  Yes, due to input limitations. That’s why you should know the proper OoO so you can enter them in the calculator in the correct order.

                  Many programming language follow their own unique OoO.

                  Yeah, they are literally different languages …

                  I don’t think you understand what wrong means.

                  You sure are giving me detailed demonstration.

                  Let’s give me another example. If everyone switched the world “dog” and “shoe” and used them with inverted meaning … everything would be fine. The world would go on without issue. It’s fun though experiment.

                  But as soon as you go around point at people’s shoes and calling them “dog” or seriously campaigning for the words to offically swap meaning … well then you’re just being retarded.

                  • Umbrias ( Umbrias@beehaw.org ) 
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                    3 years ago

                    Not just due to input limitations.

                    I don’t need to give a detailed demonstration, we both agree that OoO is arbitrary and have examples of alternative systems. You agree on these points, you just want to claim addressing pemdas as arbitrary and disagreeing with a design choice is a slur.