What does the term "calculation engine" mean?
Excel as a typical calculation engine
finaquant .NET libraries as calculation engines with table functions and parameters
Summing up

Related article at finaquant.com:

finaquant® protos, noncommercial free calculation engine (.NET library):

Presented by: Tunç Ali Kütükçüoglu
Music: Block flute (alto recorder) and piano played by Tunç Ali Kütükçüoglu

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