### Questions (12)

 2 How do mathematicians know the problems they're trying to solve are not undecidable? 1 What is the formulae for higher-order finite differences in several variables? 1 Can partial derivatives be expressed as a fraction? 1 Indicator functions vs. conditions 1 Question about unexpected hanging paradox

### Reputation (234)

 +5 What is the formulae for higher-order finite differences in several variables? +10 Tennis Paradox Probability +5 Can partial derivatives be expressed as a fraction? +5 How do mathematicians know the problems they're trying to solve are not undecidable?

 4 Why is a machine producing 7 nails in 9 seconds faster than one producing 11 nails in 14 seconds? 3 Show that $\frac{1}{2} +\frac{1}{2^2} +\frac{1}{2^3} + … +\frac{1}{2^n} < 1$ 1 Tennis Paradox Probability 0 What is the formulae for higher-order finite differences in several variables? 0 Show that $f(x,y,z)=6x^2+4y^2+2z^2+4xz-4yz \geq 0$ for all $x, y, z$ except for $x=y=z=0$

### Tags (24)

 4 fractions 0 polynomials × 2 3 geometry 0 multivariable-calculus × 2 3 algebra-precalculus 0 eigenvalues-eigenvectors × 2 1 probability × 5 0 finite-differences × 2 1 paradoxes × 2 0 pde × 2