Patent Document ID: 7885456
Application ID: 11693299

Base Claim:
1. A method comprising: receiving strokes representing a handwritten equation; for each stroke, a processing unit forming path scores for a combination of a symbol-relation pair that represents a symbol in a particular relation to a predecessor symbol and a predecessor symbol-relation pair that represents the predecessor symbol in a particular relation to a further predecessor symbol, wherein forming path scores comprises forming a plurality of path scores for the combination of the symbol-relation pair and the predecessor symbol-relation pair, each path score being associated with a different number of strokes being assigned to the symbol in the symbol-relation pair and selecting a best path score from the plurality of path scores; using the path scores to construct a symbol graph comprising nodes connected by path segments, each path segment having a path segment score that is based in part on a path score and representing at least a symbol-relation pair; using the symbol graph to identify a recognized mathematical expression that represent the handwritten equation; and storing the recognized mathematical expression.

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Claim 6:
6. The method of claim 1 wherein using path scores to construct a symbol graph comprises adding nodes and path segments to the graph while backtracking through path scores from the last stroke in the received strokes to the first stroke in the received strokes.