What proof do you have that using a left to right rule is universally true?
From my understanding It’s an agreed convention that is followed which doesn’t make it a universal truth. If we’re all doing it just to make things easier to understand, that implies we could have a right to left rule. It’s also true that not all cultures right in the same way.
But here is an interesting quote from Florian Cajori in his book a history of mathematical notations.
Lastly here is an article that also highlights the issue.
Some of you are already insisting in your head that 6 ÷ 2(1+2) has only one right answer, but hear me out. The problem isn’t the mathematical operations. It’s knowing what operations the author of the problem wants you to do, and in what order. Simple, right? We use an “order of operations” rule we memorized in childhood: “Please excuse my dear Aunt Sally,” or PEMDAS, which stands for Parentheses Exponents Multiplication Division Addition Subtraction.* This handy acronym should settle any debate—except it doesn’t, because it’s not a rule at all. It’s a convention, a customary way of doing things we’ve developed only recently, and like other customs, it has evolved over time. (And even math teachers argue over order of operations.)
What proof do you have that using a left to right rule is universally true?
From my understanding It’s an agreed convention that is followed which doesn’t make it a universal truth. If we’re all doing it just to make things easier to understand, that implies we could have a right to left rule. It’s also true that not all cultures right in the same way.
But here is an interesting quote from Florian Cajori in his book a history of mathematical notations.
Lastly here is an article that also highlights the issue.
https://scienceblogs.com/evolutionblog/2013/03/15/the-horror-of-pemdas