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A formula "refers to the general construct of a relationship between given quantities"\cite{formulaWikipedia} while a math formula "is an entity constructed using the symbols and formation rules of a given logical language." \cite{formulaWikipedia}  Mathematical expressions are currently saved via TeX Strings strings in the source of Wikipedia articles and represented  as pictures in Wikipedia. to viewers.  They are marked and formatted with the \verb|| tag. It's This Formatting from TeX string to a picture is  part of an extention of Wikibase called "Math extension", which extension". It  enables the connection between Wikipedia and MathML, which enables formatting of the expression as a readable output for the users. The TeX string \verb|r = \frac{1}{2} d| can be displayed as $r = \frac{1}{2} d$. There was no data type in Wikidata yet, which could achieve the same display feature as the \verb|| tag. Each formula was embedded in the Wikipedia source, where they were not language independent and had to be added or edited in each language separately. The explanation of parts of the formula also had to be done separately and there wasn't a fixed schemata given to do so. A computer, and maybe even the user, couldn't analyze and interpret  the formula without text analysis. reading and analysing the text.  \subsection{Necessarily of the data type}