Science Memes

14681 readers

2202 users here now

Welcome to c/science_memes @ Mander.xyz!

A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

Rules

Don't throw mud. Behave like an intellectual and remember the human.
Keep it rooted (on topic).
No spam.
Infographics welcome, get schooled.

This is a science community. We use the Dawkins definition of meme.

Research Committee

[email protected]

Other Mander Communities

Science and Research

Biology and Life Sciences

Physical Sciences

Humanities and Social Sciences

Practical and Applied Sciences

Memes

Miscellaneous

founded 2 years ago

MODERATORS

[email protected]

416

1 + 1 (mander.xyz)

submitted 10 months ago by [email protected] to c/[email protected]

47 comments fedilink hide all child comments

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 24 points 10 months ago* (last edited 10 months ago) (2 children)

ok, I define 1 as {∅} and 2 as {∅, {∅}}

proving the addition holds is slightly more complicated

[–] [email protected] 11 points 10 months ago (2 children)

Now define "+"

[–] [email protected] 30 points 10 months ago (1 children)

I love the comment that it's "occasionally useful"

[–] [email protected] 16 points 10 months ago (1 children)

Hmm yes.. set theory... I don't understand anything happening here

[–] [email protected] 10 points 10 months ago* (last edited 10 months ago) (1 children)

There is actually a really good explanation for us math-curious non-mathematicians here:
https://blog.plover.com/math/PM.html

[–] [email protected] 2 points 10 months ago

That's some good read, thank you so much.

[–] [email protected] 7 points 10 months ago (2 children)

+ 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.

[–] [email protected] 4 points 10 months ago (1 children)

seems a little sus to use + to define +

[–] [email protected] 8 points 10 months ago

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.

[–] [email protected] 4 points 10 months ago* (last edited 10 months ago) (1 children)

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. https://youtube.com/@anotherroof

Here is a playlist of the topic: https://youtube.com/playlist?list=PLsdeQ7TnWVm_EQG1rmb34ZBYe5ohrkL3t

[–] [email protected] 2 points 10 months ago

ooh, that looks interesting!