Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements
Patent
1996-06-20
1998-12-01
Nguyen, Phu K.
Computer graphics processing and selective visual display system
Display driving control circuitry
Controlling the condition of display elements
G06F 1500
Patent
active
058445552
ABSTRACT:
A method and system for locking a defined portion of the live mathematical document. A live mathematical document program, executed on a computer processor, allows a user to edit a live mathematical document and also processes the document. The user can enter mathematical expressions in any position in the live mathematical document. The program automatically updates the live mathematical document to ensure that all expressions are consistent with all expressions upon which they depend. The user can position a first boundary line and a second boundary line in the live mathematical document. The program locks an area on the live mathematical document, the locked area being the area between the first boundary line and the second boundary line. An editor allows editing of expressions in the live mathematical document, and ascertains whether an edit is within the locked area and disallows such edits. Expressions, including expressions in the locked area, are automatically updated by the live mathematical document program to ensure that all expressions in the live mathematical document are consistent with all expressions upon which they depend.
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Menaker Samuel
Stout Michael
Mathsoft, Inc.
Nguyen Phu K.
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