Mathematics

cross-posted from: https://lemmy.today/post/9963785

Hi,

I've found on Wikipedia the following formula to calculate the BMR estimation

We can read just after the formula:

According to this formula, the woman in the example above has a BMR of 1,204 kilocalories (5,040 kJ) per day.

But when I take their example of a 55-year-old woman weighing 130 pounds (59 kg) and 66 inches (170 cm)

and do ((10*55)+(6,25*170)-(5*55))-161 I get 1,217 and not 1,204

Am I doing something wrong ?

Thanks.

A curious math problem I came up with: given a target, what's the fewest digits an integer must have (in a given base) to contain all integers from 0 to the target, as substrings?

http://wok.oblomov.eu/mathesis/number-substrings/

@mathematics @[email protected] @[email protected]

e.g. for a target of 19 a candidate representative would be 1011213141516171819 in base 10, that has 19 digits. Can it be done in less, or is $\sigma_10(19) = 19$?
Can we find a general rule? Any properties of this function?

#math #maths #numberTheory #combinatorics

Geometric Shapes and Their Symbolic Meanings

https://www.learnreligions.com/geometric-shapes-4086370

Forms ranging from circles to dodekagrams have significance in many philosophies

@[email protected] @[email protected]

#mathematics #geometry

Merging Fields, Mathematicians Go the Distance on Old Problem

https://www.quantamagazine.org/merging-fields-mathematicians-go-the-distance-on-old-problem-20240401/

Mathematicians have illuminated what sets of points can look like if the distances between them are all whole numbers.

#mathematics @[email protected] @[email protected]

Mathematics Ancient Egypt, The Incredible Achievements

https://mythologis.com/blogs/egyptian-mythology/mathematics-ancient-egypt

The #ancientEgyptians were known for their advanced understanding of #mathematics and its many practical uses. From the construction of the iconic #pyramids to their use of algebraic techniques to solve problems, the ancient Egyptians were masters of the mathematical arts.

@[email protected] @[email protected]

How the number pi inspired a writing style

https://www.bbc.com/future/article/20160311-how-the-number-pi-inspired-a-writing-style

The number pi, which is celebrated with its own day on 14 March, has inspired “Pilish” – a fiendishly challenging form of writing. There’s even a Pilish novel. Give it a go yourself, it can be strangely addictive...

#pilish #pi #pigreco #mathematics #writing #poetry @[email protected] @[email protected]

Number symbolism

https://www.britannica.com/topic/number-symbolism

#IanStewart for #Britannica

#mathematics @[email protected] @[email protected]

Topologists Tackle the Trouble With Poll Placement

https://www.quantamagazine.org/topologists-tackle-the-trouble-with-poll-placement-20240326/

Mathematicians are using topological abstractions to find places where it’s hard to vote.

#topology #mathematics @[email protected] @[email protected]

Mathematician who tamed randomness wins Abel Prize

https://www.nature.com/articles/d41586-024-00839-6

#MichelTalagrand laid mathematical groundwork that has allowed others to tackle problems involving random processes.

#AbelPrize #mathematics @[email protected] @[email protected]

It's an approximation but still... It's an interesting quick read.

cross-posted from: https://slrpnk.net/post/3863820

Institution: Berkeley
Lecturer: Richard E Borcherds
University Course Code: Math 250A
Subject: #math #grouptheory
Description: This is an experimental online course on mathematical group theory, corresponding to about the first third of the Berkeley course 250A (introductory graduate algebra). The level is for first year graduate students or advanced undergraduates. The topics covered are roughly the parts of group theory that a mathematician not specializing in groups might find useful.

More at [email protected]

Sometimes I'll feel like "yeah, I know some math, I can do integrals!", then watch some YouTube video from Micheal Penn about why there's no three dimensional complex numbers, and suddenly it's dark magic. I understand absolutely n o t h i n g. it's impressive, inspiring, depressing, overwhelming, all at the same time. There's no fancy words. It's all mundane words like set, algebra, etc. but they're strung together in arcane ways. it's more overwhelming because you understand the individual words but they're a whole other language when together.

I hate paying for the app and I wish kahn academy had something like it.

Anyone else love this app. It's definitely helping me with looking at basic math in a new way. It's fun and I'll keep going.

What courses are you or have you taken?

Should we make a community?

Have another resource like brilliant? I know Khan Academy, but they are very much deep dives.

I'd really love to create a free resource like this app.