Phira

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327 Answers

newest activity votes
51
True or false? $x^2\ne x\implies x\ne 1$
34
“How long 'til we get there?” Road trip puzzle
23
Identity for convolution of central binomial coefficients
22
The Mathematics of Tetris
22
How can I sum the infinite series $\frac{1}{5} - \frac{1\cdot4}{5\cdot10} + \frac{1\cdot4\cdot7}{5\cdot10\cdot15} - \cdots\qquad$
17
How to study math to really understand it and have a healthy lifestyle with free time?
15
Is $\pi$ more transcendent than $e$?
14
Are there any generic thinking approaches for providing mathematical proofs to a given theorem
14
Intuitive use of logarithms
13
Solve $f(f(n))=n!$
12
Computing: $\lim\limits_{n\to\infty}\left(\prod\limits_{k=1}^{n} \binom{n}{k}\right)^\frac{1}{n}$
12
Is learning (theoretical) physics useful/important for a mathematician?
12
Counting trails in a triangular grid
11
What is the largest order of any element in $U_{900}$?
11
Mathematicians whose names are commonly mispronounced
10
Evaluation of the limit $\lim\limits_{n \to \infty } \frac1{\sqrt n}\left(1 + \frac1{\sqrt 2 }+\frac1{\sqrt 3 }+\cdots+\frac1{\sqrt n } \right)$
10
Why is it okay to say two groups are the same, when they're really isomorphic?
10
With probability $o(1)$
10
Unique Representation and The Fundamental Theorem of Arithmetic
10
Why does the ideal $(a+bi)$ have index $a^2+b^2$ in $\mathbb{Z}[i]$?
9
Existence of sequence such that $N$ divides the sum of the first $N$ terms for all $N$
9
Number of $(0,1)-$matrices with exactly two $1$'s in each row and column
9
When to give up on math?
8
Convergence of $a_{n+1}=\frac{1}{1+a_n}$
8
Find the square root of the polynomial
8
Why do we pick $\frac{1}{1-x}$ for $f(x)=1+x+x^2+x^3+…+x^n$, where $n$ tends to infinity?
8
Confidence level in answer being correct when multiple people give that same answer
8
Addition of functions question
8
Some complex analysis problems
7
Prove that $4^{2n} + 10n -1$ is a multiple of 25
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