1 + 1 - Mander

1 + 1 = 2 * 0.999…
Error, float detected when int expected
Programmer: “OK”
programmer: “11”

It’s not 10?

Also, oh God, I got yours as I was typing.

confluence of base-2 jokes and javascript jokes…
could have been worse, I could have said `
Am I misunderstanding? ‘1’ + ‘1’, 49+49 = ‘b’

concat: “11”

cat: ignores your inquiry

No that’s “1” + “1”
Looks Good To Me!
Appliance salesperson: oven + pan = hamburger
1+1=3 in cases of large 1’s
What’s great is the kid is correct even with the factorial
I appreciate the latex-style quotes around the mathematician’s 1
Terrence Howard : 2 !! Also 1x1=2 !!
Computer Scientist: 0 and a carry bit Mathematician: S(1)
How would a two year old know factorials?
ok, I define 1 as {∅} and 2 as {∅, {∅}}
Now define “+”

I love the comment that it’s “occasionally useful”

Hmm yes… set theory… I don’t understand anything happening here
There is actually a really good explanation for us curious non-mathematicians here:
blog.plover.com/math/PM.html
1+1=2

From the highly eclectic blog of Mark Dominus

The Universe of Disco : 1+1=2
That’s some good read, thank you so much.
+ is a map from N×N to N where a + 0 = a and a + S(b) = S(a + b) (S is the successor function that gives the next number).
Then 1 + 1 = 1 + S(0) = S(1 + 0) = S(1) = 2.
seems a little sus to use + to define +

No, it’s correct. You define the operation by it’s properties. It’s not saying that “a plus 0 = a” but "the result of applying the binary operation ‘+’ to any number with 0 should give the original number."

  • is just a symbol. You could instead write it as +(a,0)=a and +(a,S(b))=S(+(a,b)).

You have to have previously defined 1=S(0), 2=S(1), 3=S(2), and so on.

I really recommend the YouTube channel “Another Roof”. His first few videos were building up exactly this idea, as well as building up all the real numbers (possibly complex too if I’m remembering correctly). Sounds like a dry topic but he uses humour really well throughout. youtube.com/@anotherroof
Bevor Sie zu YouTube weitergehen

ooh, that looks interesting!
Engineer: 2, but 3 to be safe.
Was going to say: 2ish
Wouldn’t they just look up the answer in a table?

Nah not anymore, now you spend a day or so building some convoluted excel calculator once so that you never need to do the calcs again.

Then, 3 years later when you go to add or change something in that calculator, you have absolutely no idea how it works and decide the change wasn’t that important anyway.

The budget is for 1.5, make it work.
Oh, hi Boeing Manager.
new captha alert 1 + 1 = 2 to enter
1 + 1 is not equal to a question mark.
What did 1 minus 1 equal before zero was invented? 🤔

Yeah, define “zero”.

The one invented on India at around the Middle Age is a different one. The one you are asking about is very old.

You can’t put an expression on the left-hand-side of the assignment operator.
You need more expressive languages.

You forgot accountant

“What do you need it to be?”

We need to report negative earnings so we don’t have to pay taxes obviously
Math isn’t induction. Its deductive logic.
I’m surprised the 6 year old knows factorials.
Not only that, it is mathematically correct, at least given the usual definitions of 1, 2, +, and !

How old this be inductive reasoning?

Surely the philosopher is the one looking for definitions…