r/MathTheory • • Aug 15 '19

A possible new foundation for Set Theory

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5 Upvotes

r/MathTheory • • Sep 15 '18

0/0 if not undefined

4 Upvotes

This is an idea that I've had for a while but if 0/0 wasn't undefined, would it be equal to 0 or 1???


r/MathTheory • • Aug 25 '17

Theoretical length and width of the 103 times folded paper aside from depth.

4 Upvotes

Used an online scientific calculator and google calculator for this is it is what it is. Most of you know that the paper folded 103 times would be as long as the observable universe, well what about the other dimensions.

\2662.405555600257685 planck length (length) \3438.9405093169989414 planck length (width)

\216x6.25e+31 for the width and 279x6.25e+31 for the length

\divide both by 5.0706024e+30. You will equate the full answers above.

\Now for a size comparison the sun is 1,392,000,000 Meters in diameter. \Hydrogen's atomic nucleus is 1.75 Femtometers in width.

\1,750,000,000 meters would be the nucleus compared to the sun if blown up to the billion mark in comparison.

\So it is slightly bigger so how do we compare the paper at this point?

\The paper would be 0.0042598488889604123331 centimeters in length and 0.0055023041814907195507 centimeters in width to a comparative size.


r/MathTheory • • Feb 14 '14

Introduction to Topology

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4 Upvotes

r/MathTheory • • Jul 11 '13

Zermelo's Axiomatization of Set Theory

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4 Upvotes

r/MathTheory • • Jan 30 '20

4D Theory of Time

3 Upvotes

If you consider that time is not linear, and imagine the construction of a hypercube, a cube in four dimensions, then the assembly of this hyper cube is also not linear. Therefore, each individual cube assembled, including the center cube, is both present and absent in its correct position at any given point. This would also include the outside shape of the structure; it would be present because the hyper cube is both assembled and not. I believe in a way, there is space inside a 3D hyper cube in non-linear time and there is not space. I believe this theoretical space could be related to time proving that time is indeed the fourth dimension.


r/MathTheory • • Jan 17 '18

Dimensions in math

3 Upvotes

Found math later in life, so thanks for your time. I have recently been interested in dimensions. I watched Carl Sagan's Flatland discussion of the fourth dimension and kind of get it a little, but then I spoke to an engineer friend who only talked of the fourth dimension as a coordinate in time. Its like they are using the same word for different ideas. I think dimensions are defined as a characteristic that can be measured, but there is a tesseract, which can be measured in four dimensions and there is time which can also be measured but in a totally different ways. Is Sagan talking about a pure mathematical structure which is atemporal? If so is that dimension different from the 4 dimensions as engineers define them? Thanks.


r/MathTheory • • Jan 11 '18

Pythagoras' Theorem

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3 Upvotes

r/MathTheory • • Dec 24 '17

A Curious Math Fact

3 Upvotes

I sort of randomly discovered this: For any whole number, the difference between that number and the number formed by reversing the order of its digits, will be evenly divisible by nine. (Neglect the sign)

And, Of the resulting differences, an unexpectedly large proportion will be palindromes.

Anybody heard of this? Is it provable?


r/MathTheory • • Feb 15 '14

Introduction to Algebraic Topology and other great videos on this channel

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3 Upvotes

r/MathTheory • • Feb 07 '14

Introduction to Group Theory

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3 Upvotes

r/MathTheory • • Jul 10 '13

Knots and Braids

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3 Upvotes

r/MathTheory • • Jul 19 '26

Divisibility tricks for primes (add x times last to rest)

2 Upvotes

I have no idea how well known this is, but I was toying around with the numbers from wikipedia's "divisibility rule" page, like finding what to multiply the last digit by before adding to the rest to find out if a number is divisible by 139 (14 btw) , etc. and I ended up finding out that the number to multiply by seems dependent solely on prime and the last digit of the prime:

end=1: (p*9+1)/10

end=3: (p*3+1)/10

end=7: (p*7+1)/10

end=9: (p*1+1)/10

I even checked much larger primes using terrible python code: (32000167*7+1)/10=22400117, which is the number needed to multiply by... initially because I was trying to find out if any number was multiply by 17 (or certain other numbers) , which there don't seem to be any

Also, x appears to be "circular", sorry if the word is incorrect, but I mean that it works no matter how many times you add or subtract p to/from x, which creates the "subtract y times last from rest", -y=x-p

Closest I could find on the wiki page was under "Divisors Ending in 1, 3, 7, or 9 in base 10", which... might be the same... it's really hard for me to tell... But I could be missing something, even something very obvious, which is why I'm here


r/MathTheory • • Jun 28 '26

PRIME numbers :)

2 Upvotes

pattern :)


r/MathTheory • • May 30 '26

4 Block Model क्या है? | 4 Block Model आधारित पाठ योजना (Math Pedagogy)

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2 Upvotes

r/MathTheory • • Nov 26 '19

Numbers Don't Exist

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2 Upvotes

r/MathTheory • • Sep 07 '18

Polygon theory

2 Upvotes

If you take any polygon you can take any side and call it a vertex because it's a 180 degree angle. It is impossible to name a polygon because it has more corners.


r/MathTheory • • Dec 28 '17

Input wanted from the community for a thought I have

2 Upvotes

Hi everyone, hope you are all doing well. I have an idea that I would like to develop further using mathematics. Quick background, I am a college student and my highest math taken is Cal 3. So I have a very shallow understanding of mathematics. My idea is this, I believe that there are an several forces at play within the same plane of existence, and the only reason we humans cannot experience them is because there are other forces nullifying them preventing us from experiencing them. I also believe that all of space exists in the same plane, and it is the forces I mentioned earlier that prevent us from being able to travel from plane to plane that are really in the same plane. In order to gain more insight, what mathematical theories should I be studying? Thank you all who read and respond.


r/MathTheory • • Dec 25 '17

Spiral Napkin Stack?

2 Upvotes

Not sure if this is the right place to put this but my aunt can create a spiral stack of napkins by folding them in half over and over again. Can anyone explain the math behind why [this] (https://imgur.com/a/GJSLE) works?


r/MathTheory • • Dec 22 '17

GEOMETRİDE BİR KISAYOL BULDUM!

2 Upvotes

r/Turkey !! Bir üçgenin 2 kenarını biliyorsak, 3. kenarının uzunluklarını bulmak için kullanmamız gereken formül şöyledir. (1. kenara "a" 2. kenara "b" diyelim, 3 kenara da x diyelim) |a-b|<x<a+b bu şekilde x = a-b ile a+b arasındaki tüm sayılar olur. Eğer bir dörtgen ya da başka bir çokgenin son kenarını bulmak istiyorsak da o çokgenleri üçgenlere böleriz ve bu metotu uygulayarak son kenarını buluruz. Bu arada x'in en büyük tam sayı değeri ise a+b'den küçük en büyük tam sayıdır. Fakat ben bu işe büyük bir kısayolu buldum. 2 kenarını bildiğimiz bir üçgen olduğunu varsayalım. 1. kenarı 3 br 2. kenarı 7 br olsun.(Değerleri tüm gerçel sayılar arasında değiştirebilirsiniz) Normal bir durumda son kenarı bulmak için kullandığınız yöntem "|3-7| < x < 7+3 = 4 < x < 10" dir. Ve bu durumda x'in en büyük tam sayı değeri 10'dan küçük en büyük tam sayı olan 9'dur. Fakat benim çok daha kısa olan yöntemime göre üstünde çalıştığınız çokgenin bilinmeyen kenarı hariç tüm kenarlarını toplayıp 1 çıkardığınızda x'in en büyük tam sayı değerini bulursunuz. Hemen kontrol edelim. 3+7-1 = 9 . Gördüğünüz gibi x'in en büyük tam sayı değerini bulduk. Ben bu yöntemi ongene kadar tüm çokgenlerde denedim ve hepsinde başarılı oldum. Dörtgen ve daha fazla köşeli çokgenlerin normal yönteminde çalıştığınız çokgenleri üçgenlere ayırarak yaparsınız bunu. Ben ise aynı şekilde bilinmeyen hariç tüm kenarları toplayıp 1 çıkartarak en büyük tam sayıyı bulabiliyorum.

Bu fikir ve metin YILMAZ EMRE ÜÇYILDIZ ŞAHSINA AİTTİR. Ve bu şahısdan önce bu fikrin sözü hiç geçmemiştir.


r/MathTheory • • Dec 09 '17

how you calculate a body's mass and volume given its gravitational acceleration?

2 Upvotes

Sorry if this is the wrong place for this, but it's bugging me.


r/MathTheory • • Dec 12 '16

Help needed to identify mathematical relationships between components that make up an atom verses components that make up a cell verses components that make up Galaxy in terms of distance.

2 Upvotes

I would like to investigate underlying patterns, through the mathematics framework, between different sized scales throughout the universe in an attempt to unify understandings under a new lens.


r/MathTheory • • Oct 18 '13

Leibniz's Laws of Continuity and Homogeneity [PDF]

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2 Upvotes

r/MathTheory • • Jul 10 '13

Knot Theory

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2 Upvotes

r/MathTheory • • Jun 12 '13

The Continuum Hypothesis

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2 Upvotes