The term *propto* occurs in indexes or keywords of following Zvon materials:

- Characters
- Mathematical Markup Language (MathML) Version 2.0 :
**propto**[*Entities*]an XML application for describing mathematical notation and capturing both its structure and content - External resources
*MathML Test Suite 2.0*http://www.w3.org*Mathematical Markup Language (MathML) Version 2.0*http://www.w3.org

Zvon keyword: *propto*

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