[tex] \begin{bmatrix}(adsbygoogle = window.adsbygoogle || []).push({});

1 & \frac{1}{2} & \frac{1}{3} \ldots & \ldots & \frac{1}{n}\\

\frac{1}{2} & \frac{1}{3} & \frac{1}{4} \ldots & \ldots & \frac{1}{n + 1}\\

\frac{1}{3} & \frac{1}{4} & \right \frac{1}{5}\ldots & \ldots & \frac{1}{n + 2}\\

\vdots & \vdots & \vdots & \ddots & \vdots\\

\frac{1}{n} & \frac{1}{n + 1} & \frac{1}{n + 2} & \ldots & \frac{1}{2n - 1}

\end{bmatrix} [/tex]

Express the individual entries [tex]h_i_j[/tex]in terms of i & j.

The answer is

[tex]h_i_j = \frac{1}{i + j - 1} [/tex]

but I can't for the life of me understand how you would recognize that this formula fits the pattern formed in the matrix.

If you were answering this question, would you just attempt to form a formula with n's, i's and j's floating around or is there some method that would be helpful when addressing these types of problems?

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Nxn Hilbert Matrix terms

**Physics Forums | Science Articles, Homework Help, Discussion**