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John Cook

Discussion  - 
 
How should two team captains fairly pick players sequentially?
A better way to choose teams than simply alternating choices is to use the Thue-Morse sequence.
2
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George Kennedy

Math Questions  - 
 
is there a Laplace inverse for bear constant.
L^-1{(Constant)}. if no,  why not? and if yes why yes? and how is it computed or derived?
1
maria manion md's profile photo
 
sorry wrong person to ask
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Rick Saucedo

Communities  - 
 
,
2
Alice Boldrini's profile photo
 
Hmmm... Much hard. Too hard. How do I solve this one?
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Jack James

Discussion  - 
 
Can Math describe conscious experience? Join my adventure.
2
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Jean DAVID

Communities  - 
 
Maths notation : Triangle of power
Okay, let's get something straight right off the bat - logarithmic notation in maths is bad and doesn't make a whole lot of sense. And on the one hand, who cares, because maths is so much more than notation anyway. But on the other hand, it makes...
15
4
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Eruthupathi R

Videos/Pictures  - 
3
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pett pette

Discussion  - 
 
Mine is the Fundamental theorem of Arithmetic
15
3
asraful islam's profile photoAmit Dhawan's profile photo
23 comments
 
Fundamental theorem of arithmetic
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Eddy Vasile

Discussion  - 
 
My new favorite number is: 99,194,853,094,755,497
That is:
ninety-nine quadrillion, one hundred ninety-four trillion, eight hundred fifty-three billion, ninety-four million, seven hundred fifty-five thousand, four hundred ninety-seven
It's the eightieth number in the Fibonacci series (81st if you count C style) and it's also a prime.
If you look at Fibonacci numbers that are also prime numbers, they behave just as Benford's law predicts - start with low digits and don't have a lot of 9s.
2
3
5
13
89
233
1597
28657
514229
433494437
2971215073
And then my number comes roaring in with five 9s including one in the starting position.
I'd like to name this number. Maybe Nibiru (just like Planet 9). Notice how Nibiru sounds a lot like "number?" Just saying...
Here's the Python code to generate these numbers:
#######################
from math import sqrt; from itertools import count, islice
def isPrime(n):
return n > 1 and all(n%i for i in islice(count(2), int(sqrt(n)-1)))
a,b = 1,1
n=int(input("Enter max: "))
for i in range(n-1):
a,b = b,a+b
if isPrime(a):
print(a)


14
Pooja Rada's profile photoTyler Baxter's profile photo
2 comments
 
Nibiru? Planet 9? Says who?

David Icke doesn't count.
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Krieger Helton

Math Questions  - 
 
What is 40 divided by 1/2, plus 15?
394 votes  -  votes visible to Public
95
88%
35
9%
100
2%
0
1%
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Aahan Tulshan's profile photoLogun Lofer's profile photo
6 comments
 
divide with 0.5 which is equal to 1/2 then you will get answer
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Homework Guru

Discussion  - 
 
The exaggeration created about importance of GPA during studies takes a toll on the student's life. Almost fifteen precious years in one's life are devoted to worrying about GPA's. Sometime, the question arises as to if these GPA s really matter? Let's try to find out.
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2
Mick Carson's profile photo
 
Let's hope they are intelligent enough to read, write and speak English and not end up like the illiterates of today who use wrong words when conversing or writing a sentence. holding a certificate, diploma, or a bachelor's degree doesn't necessary make you a smart person on one way or another. I have all that and people still think I am stupid.
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Stefan Lapointe

Videos/Pictures  - 
 
THIS IS ABSOLUTLY AMAZING!!!
8
1
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Tim Brzezinski

Freq Posts/Tricks  - 
 
Thebault's Theorem "Proof" without Words, Segment Lengths, or Angle Measures:
https://www.geogebra.org/m/m8Kha6pa
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About this community

Welcome to the Mathematics Community! Please read the community guidelines before posting: http://goo.gl/SjFp4. Here are the most import things you need to know: *Please check the Dr. Math FAQ if you've got a question that might be common. You might be posting about something that we've already seen numerous times. http://mathforum.org/dr.math/faq/ *Don't link-litter.* If you've found an interesting article that you think the Mathematics community needs to see, please share it! But we want to know why you think it's share-worthy. *No unrelated ads or spam.* *Don’t cheat on homework, classwork, or other exercises.* This community is not well-suited for homework help (see homework policy below), but it has zero tolerance for cheaters. Cheaters will be banned. *Categorize correctly.* *Keep posts relevant to mathematics in some way.* Wondering why your post was removed? Read the complete community guidelines.

Landon Azbill

Discussion  - 
 
I found a formula for something similar to the cross product except it works in an arbitrary number of dimensions, and was wondering if there were any other formulas like that that anyone here could refer me to so I could compare results.
2
Osama Rashwan's profile photoLayra Idarani's profile photo
5 comments
 
In what sense is it similar to the cross product? Lie brackets are also a generalization of the cross product to arbitrary dimensions, acting like cross products in a different way than how wedge products act like cross products. There are also Clifford algebra products, which are yet another way of getting cross-product-like generalizations.
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Fourier Art

Videos/Pictures  - 
 
Círculos que se besan...
 ·  Translate
50
13
George Pazhaidam's profile photo
 
Great is Human Wisdom.....
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Jean DAVID

Challenges  - 
 
Spot the bird - Solution
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4
Rene Grothmann's profile photoBrundizzle B (verified by your mother)'s profile photo
2 comments
 
too difficult... it's altitude is H.
problem solved ☺️
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Cara menghitung nilai eigen dan vektor eigen 
 ·  Translate
2
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Krieger Helton

Puzzles/Riddles  - 
 
50
30
10 =? 
117 votes  -  votes visible to Public
50
7%
30
4%
10
89%
7
Neha Krishnakumar's profile photoMahmood W. Tamjid's profile photo
8 comments
 
what are you asking?
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Iwuchukwu Obieze

Math Questions  - 
16
Gerhard Fang's profile photoRefurio Anachro's profile photo
10 comments
 
Well, because the question itself is part of the puzzle I decided the simplest was to study how the cylinders rotate when the ropes get pulled. But then the way the angles are marked in the picture does look funny.

Your interpretation (that we change d instead) was what made me realize this fact, which is actually only about the way I've put it, +Gerhard Fang​​.
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Astrum

Videos/Pictures  - 
 
Interested to know how big the solar system would be if the Sun was the size of a soccer ball? A grain of sand? 1.5um? We go through the maths to find out!
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2
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