### Questions (16)

 18 What do mathematicians mean when they say some conjecture can’t be proven using the current technology? 7 Where to go after “olympiad math”? [closed] 4 How would you prove if $ab|(a+b)(a+b+1)$, then $(a,b) \leq \sqrt{a+b}$ for positive integers $a$ and $b$? 3 Why is $e = \lim\limits_{x\to 0} (1+x)^\frac{1}{x}$? [duplicate] 2 Can a function's derivative switch signs without crossing zero?

### Reputation (767)

 +10 What do mathematicians mean when they say some conjecture can’t be proven using the current technology? +20 Can a function's derivative switch signs without crossing zero? +10 What's wrong with my method of counting the number of $7$s under $1000000$? +2 Solving $\ln\left(\frac{\displaystyle 2x}{\displaystyle x-1}\right) > 0$

 6 Is Calculus necessary for computer science student? 2 Binomial formula for multiple summands. 2 Proof that if $5\mid2a$, then $5\mid{a}$ 1 Determine remainder of the product of two numbers, when we know the remainder of each individually? 1 How to get the measure?

### Tags (40)

 7 soft-question × 4 2 geometry × 3 6 calculus × 6 2 binomial-theorem 6 computer-science 2 divisibility 6 education 2 proof-verification 3 elementary-number-theory × 4 1 learning