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 19 Ways to write “50” 13 why does this integral diverge? 12 The Convergence of Jacobi and Gauss-Seidel methods 10 Ways to write “50” 9 Value of $\sum \limits_{k=1}^{81} \frac{1}{\sqrt{k} + \sqrt{k+1}} = \frac{1}{\sqrt{1} + \sqrt{2}} + \cdots + \frac{1}{\sqrt{80} + \sqrt{81}}$?

### Reputation (3,325)

 +10 Minimizing a multivariable function given restraint +5 Accelerating linear solve in MATLAB for a specific type of matrices +25 Largange polynomial second order derivative +5 Evaluate derivative of Lagrange polynomials at construction points

### Questions (15)

 55 How much Math do you REALLY do in your job? 3 Clustering elements according to covariance matrix 3 Book request: Mathematical Finance, Stochastic PDEs 2 Derive diffusion coefficient for heat equation from random walk simulation 2 Change order of summation in double sum

### Tags (116)

 50 numerical-methods × 40 12 pde × 12 41 calculus × 20 10 analysis × 6 25 integration × 8 10 limits × 6 21 differential-equations × 16 8 real-analysis × 11 14 sequences-and-series × 9 7 matlab × 10

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