r/CasualMath

▲ 5 r/CasualMath+1 crossposts

Solved Numericals

I believe every ML related algorithm can be solved by hand, especially for very small datasets. I’m trying to find resources where topics like PCA are explained using a solved numerical approach. If anybody knows of such resources can you please share them below in the comments!

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u/i_am_casper — 23 hours ago
▲ 7 r/CasualMath+5 crossposts

[Request] How many unique equations can reach 21 using these dice?

Rules:
• Use each die exactly once
• + − × ÷ only
• Parentheses allowed

u/TargetLabs — 1 day ago
▲ 2 r/CasualMath+1 crossposts

I have created some new math signs

So I have created 7 new math signs that I think will make math better and here are they:

Half Equals Sign - this sign is used to for what we think is the answer but we haven’t checked and it is not the same as the approximation sign

Qun Sign - it is used to shorten any number, function, operations, formula or anything that you can think of it is used by adding the word qun under something and then we say that that thing is under “qun”

Nut Sign - it is used exactly like the qun sign but not only does it shorten but it also inverts it

Pre Answer Sign - it is used in the middle of a long equation to write the answer instead of writing the whole thing again and replacing everything it can be used with operations and even variables, you use it by writing it next to the thing you want to solve and it is written like parenthesis

Per Sign - this is also called pertruption and it is the exact opposite of a function so per(y)=x

In Sign - my sixth sign this is just used instead of writing “in” in math

Amount Sign - it is used to say how much of one number is in another number for example there are 2 twos in 5 and it is not the same as devision and there can also be a x or anything above it like a variable to ask the question how much fives are there in 12 for example

u/Petar_Micevski — 1 day ago
▲ 3 r/CasualMath+1 crossposts

How do I prove this theorem using deductive equation-based proof or extended equation-based proof?

16.14 a· | b ∧ a· | c ⇒ a· | (b + c) , I try two days and i got nothing

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u/MiserableAssociate10 — 4 days ago
▲ 41 r/CasualMath+2 crossposts

Upside-down numbers make some neat graphs.

Pythagorean triples

Hi all, thought this was interesting and wanted to share!

upside-down plot of (rev n, rev n^2) (math explained below)

same plot, just with lines connecting how they sequentially go.

These two plots were made using n from 1 to 500 and transforming the numbers so that when you have n=123 upside-down is n=0.321 when you have n=741 upside-down n equals 0.147. I was surprised to see the plots the way they showed up. The above plots are for upside-down n and upside-down n^2. When reading about this i read it is a form of rev (reversed) numbers. I like calling them upside-down. Throw out some sequences you would like me to drop in and I'll see how they show up.

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u/JoughJough87 — 7 days ago
▲ 1 r/CasualMath+1 crossposts

Help finding the next letter of this sequence:

F, G, L, Q, ...?

Possible answers:

a) Z

b) S

c) A

d) U

e) T

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u/Silve96 — 10 days ago