this post was submitted on 18 Dec 2025
689 points (96.4% liked)
memes
19817 readers
1228 users here now
Community rules
1. Be civil
No trolling, bigotry or other insulting / annoying behaviour
2. No politics
This is non-politics community. For political memes please go to !politicalmemes@lemmy.world
3. No recent reposts
Check for reposts when posting a meme, you can only repost after 1 month
4. No bots
No bots without the express approval of the mods or the admins
5. No Spam/Ads/AI Slop
No advertisements or spam. This is an instance rule and the only way to live. We also consider AI slop to be spam in this community and is subject to removal.
A collection of some classic Lemmy memes for your enjoyment
Sister communities
- !tenforward@lemmy.world : Star Trek memes, chat and shitposts
- !lemmyshitpost@lemmy.world : Lemmy Shitposts, anything and everything goes.
- !linuxmemes@lemmy.world : Linux themed memes
- !comicstrips@lemmy.world : for those who love comic stories.
founded 2 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
says person who pointed out to begin with it was talking about conventions. BWAHAHAHAHAHA! I even underlined it for you. Ok, then, tell me which convention exactly they are talking about if it isn't left to right 😂
It quite clearly states that left to right is a convention 🙄
"the other" wasn't even the subject at hand. 🙄 Here you go then...
But not within the scope of rules 🙄
There you go again not being able to say what the RULES for them are! 🤣🤣🤣 I admitted nothing of the kind by the way. I already told you 3 times they obey the same rules 🙄
It's pretty rubbish actually - finding a blog post by someone as ill-informed as you doesn't make it "great". Note that I always cite Maths textbooks and thus have no need to ever quote blog posts? 😂
Because (sigh) the same rules apply to all notations 🙄
Yep, and are separate to the rules, which are the same for all notations
Nope. Doesn't say that anywhere. Go ahead and screenshot the part which you think says that. I'll wait
Doesn't say that either. 🙄 Again, provide a screenshot of where you think it says that
BTW this is completely wrong...
"Infix notation needs extra information to make the order of evaluation of the operators clear" - Anyone who knows the definitions of the operators and grouping symbols is able to derive the rules for themselves, no need for any "extra information" 🙄
"For example, the usual rules for associativity say that we perform operations from left to right" - The thing we just established is a convention, not rules 🙄
"so the multiplication by A is assumed to come before the division by D" - Which we've already established can be done in any order 🙄
No, you actually. You know, the person who can't find a single textbook that agrees with them 😂
NONE of which were Maths textbooks, NOR Maths teachers 😂
None of which are actually ambiguous. He should've looked in a Maths textbook before writing it 😂
"the 48/2(9+3) question" - 48/2(9+3)=48/(2x9+2x3), per The Distributive Law, as found in Maths textbooks 😂
Did you even read it?? Dude doesn't even know the definition of Terms, ab=(axb) 🤣🤣🤣
"Without an agreed upon order" - Ummm, we have proven rules, which literally anyone can prove to themselves 😂
"There is no mathematical reason for the convention" - There are reasons for all the conventions - talk about admitting right at the start that you don't know much about Maths 🙄
It only explains the mnemonics actually, not why the rules are what they are. 🙄
Did you read it?? 🤣🤣🤣
"The order of operations — as Americans know it today — was probably formalized in either the late 18th century" - Nope! Way older than that 🙄
It actually did a better job than all of the university blogs you posted! 🤣🤣🤣
Because not Maths textbooks, duuuuhhhh 🤣🤣🤣
Which it is as per Maths textbooks 🤣🤣🤣
The proof is it's the reverse operation to Factorising, thus must be done first 🙄
But since you hate Maths textbooks, go ahead and search for "reverse operation of distributive law" and let me know what you find. I'll wait 🤣🤣🤣
That's some awful impressive goalpost shifting. Gold medal mental gymnastics winner.
And here you are, still unable to explain why prefix and postfix notation don't have an operator precedence. I'm still waiting.
They literally don't, and I defy you to show me a single source that tells you that prefix or postfix notation use PEDMAS. I'll even take Quora answers.
Heck, I'll even take a reputable source talking about prefix/postfix that doesnt bring up how order of operations isn't required for those notations.
Right here:
Which you attempt to retort with
But then you go on to say something to the effect of "anyone who knows the rules can the extra information". Which is both unsubstantiated given the long history of not having PEDMAS, but also kind of a nothingburger.
It's literally the whole thing. Did you notice how they never discuss the need for operator precedence, or use operator precedence?
Build for me a prefix or postfix equation that you think is changed by adding parentheses (eg overriding the natural order of operations), and then go ahead and find a prefix or postfix calculator and show me the results of removing those parentheses.
If you read the rules for those notations, you'll see pretty clearly that operator precedence is purely positional, and has nothing to do with which operator it is.
No, you've show a screenshot from a random PDF. What math textbook and what edition is it?
The fact you think that factorization has to do with order of operations is shocking.
Yes the multiplication is done first, but not because PEDMAS. The law is about converting between a sum of a common product and a product of sums. No matter how you write them, it will always be about those things, so the multiplication always happens first. It doesn't depend on PEDMAS because without PEDMAS you'd simply write the equation differently and factorization would still work.
It's crazy that you're not able to distinguish between mathematical concepts and the notation we use to describe them.
But putting that aside, that's not a proof of PEDMAS.
If PEDMAS is an actual law, then there will be a formal proof or theorem about it. There are proofs for 1+1, if PEDMAS is a law then there will be an actual proof specifically about it. Not just some law and then you claim it follows that PEDMAS is true, an actual proof or theorem, or an textbook snippet explain how it is an unprovable statement.
BWAHAHAHAHAHAHA! Says person refusing to acknowledge that it's in textbooks the difference between conventions and rules 🤣🤣🤣
Yep, I know you are. That's why you had to post known to be wrong blogs, because you couldn't find any textbooks that agree with you 🤣🤣🤣
Speaking of goalpost shifting - what happened to they don't have rules?? THAT was your point before, and now you have moved the goalposts when I pointed out that the blog was wrong 🤣🤣🤣
says person who has still not posted any textbook at all with anything at all that agrees with them, to someone who has posted multiple textbooks that prove you are wrong, and now you are deflecting 🤣🤣🤣🤣
they literally *do., That's why the rules get mentioned once at the start of the blog - it's the same rules duuuhhh!!! 🤣🤣🤣
PEMDAS isn't the rules, it's a convention
I won't take anything but textbooks, and you've still come up with none
That's exactly what the blog you posted does. I knew you hadn't read it! BWAHAHAHAHAHAHAHA! 🤣🤣🤣 I'll take that as an admission of being wrong then
of a Maths textbook, with the name of the textbook in the top left, and the page number also in the top left. 🤣🤣🤣
Yep, says nothing about operator precedence being tied to the notation, exactly as I just said, so that's a fail from you then
derive the rules is what I said liar. The only thing you need to know is the definition of the operators, everything else follows logically from there.
The order of operations rules are way older than PEMDAS. It even says it in one of the blogs you posted that PEMDAS is quite recent, again showing you didn't actually read any of it. 🙄
Nothing random about it. The name of the textbook is in the top left. Go ahead and search for it and let me know what you find. I'll wait 🤣🤣🤣
So, you're telling me you don't know how to look at the name of the PDF and search for it?? 🤣🤣🤣 I can tell you know it's the #1 hit on Google
says person revealing they don't know anything about order of operations 🤣🤣🤣 Make sure you let all the textbook authors know as well 🤣🤣🤣
No, Brackets are done first.
Nope. That's the Distributive Property, and yes indeed, the Property has nothing to do with order of operations, but the Distributive Law has everything to do with order of operations.
The Property will, the Law isn't
No, Brackets are always done first
says person who doesn't even know the difference between a Property and a Law, and, as far as I can tell, have never even heard of The Distributive Law, given they keep talking about the Property
Right, it's a proof of the order of operations rules for Brackets 🙄
It isn't, it's a convention
It's true by definition. There's nothing complex about it. Just like ab=(axb) is true by definition
It isn't, it's a convention. Not sure how many times you need to be told that 🙄
You mean like textbook snippets stating that The Distributive Law is the reverse operation to Factorising?? See above 🤣🤣🤣