# Functions

> [HTML Version](functions.htm)

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See the topics listed below.

**Subtopics**

- [System-Defined Functions](system-defined-functions.htm.md)

- [User-Defined Functions](user-definedfunctions.htm.md)

- [Tab Functions](tab-functions.htm.md)

- [SOSFUNC Library Functions](sosfunc-library-functions.htm.md)