Originally, Excel was not designed to be a real database. Its early database functions were limited in quantity and in quality. And because every record in an Excel database is visible on the screen ...

For many, the INDEX-XMATCH combination in Excel is the go-to method for retrieving a value from a dataset. However, you can also use this dynamic duo to perform two-way lookups, returning a value at ...

When you dive into the world of Excel, you quickly realize the power of its functions. Among these, the INDEX & MATCH formulas stand out as incredibly versatile tools for data lookup and retrieval.

The Atiyah-Singer index theorem gives a topological formula for the index of an elliptic differential operator. The topological index depends on a cohomology class that is constructed from the ...