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Summary
This paper discusses the rationale of pen-math system called the MathBrush. The goal of the MathBrush is to support mathematical tasks which are currently done on CAS. This system uses sketch recognition technologies to allow users to input mathematical expressions using a free form sketching system. The system then recognizes these input sketches and convets them to MathML.
It uses the CAS to provide support for the entry, interaction and display of results from expressions that may be large and complex. To limit the number of commands it also supports the context sensitive menus. Working in different domains in mathematics the menu will only contain the commands used in the particular domain.
It also editing of the subexpressions. The user can just circle a particular sub expression and the expression will be extracted in a floating window for editing.
Discussion
This is a user study and doesnot give explanations on technical details on sketch recognition. It definitely uses domain specific recognition techniques since the sytem is confined to recognition of mathematical symbols.
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