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Manipulating Mathematical Formulas with a Pen

IP.com Disclosure Number: IPCOM000110803D
Original Publication Date: 1994-Jan-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Nakayama, Y: AUTHOR

Abstract

Disclosed is a technique whereby mathematical formulas can be manipulated on a pen-tablet. The extent of mathematical expressions can be adjusted by using frames and handles on the screen, and formulas can be inserted into other formulas by using compression and rearrangement operations.

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Manipulating Mathematical Formulas with a Pen

      Disclosed is a technique whereby mathematical formulas can be
manipulated on a pen-tablet.  The extent of mathematical expressions
can be adjusted by using frames and handles on the screen, and
formulas can be inserted into other formulas by using compression and
rearrangement operations.

      Input characters and mathematical expressions (root signs,
fraction lines, etc.) are displayed in frames on the screen of a
pen-tablet.  The frames show the extent of each character or
expression, and contain handles for adjusting this extent, as shown
in Fig. 1.  By dragging the handles with a pen, the size of a frame
can be changed.  By dragging the contents of a frame other than the
handles, the position of the frame can be changed.

      By means of these operations, characters and mathematical
expressions written on a tablet can be arranged as a single formula.
A formula can be changed into an icon, which is a symbol representing
a compressed formula.  An icon can be moved to another formula
(called a target formula) on the tablet as one part of that formula.
The system (program) then rearranges the parts of the target formula,
and restores the parts contained in the icon.  The rearranged formula
includes the formula that was moved.

      When the system rearranges the parts of a formula, it places
appropriate spaces between them, as shown in Fig. 2, so that icons
can be inserted anywhere in the formula...