I found a formula from that can simply derive the entries the of inverse of Vandermonde matrix. However, there is one notation that I couldn't understand which I hope someone can help me or give me a simple example. Link: https://proofwiki.org/wiki/Inverse_of_Vandermonde_Matrix. I've never seen such a sigma notation. So, can someone explains what it is?
2026-04-24 16:19:51.1777047591
inverse of vandermonde matrix
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