1. One or more computer-readable storage devices having computer-executable instructions, which when executed by one or more processing devices, cause the one or more processing devices to perform: receiving handwriting input including handwritten mathematical symbols; receiving speech input including spoken words corresponding to spoken mathematical symbols; recognizing the handwriting input to identify candidate handwritten mathematical symbols; recognizing the speech input to identify candidate spoken words; processing the candidate handwritten mathematical symbols into a handwriting graph including nodes representing the candidate handwritten mathematical symbols and arcs representing probabilities that the candidate handwritten mathematical symbols are correct; processing the candidate spoken words into a speech graph by: accessing a lookup table with the candidate spoken words recognized from the speech input to identify candidate spoken mathematical symbols; and including nodes in the speech graph representing the candidate spoken mathematical symbols and arcs representing probabilities that the candidate spoken mathematical symbols identified from the lookup table are correct; and enhancing the handwriting graph into an enhanced graph by adjusting individual probabilities in the handwriting graph based on individual matching probabilities in the speech graph.
1. One or more computer-readable storage devices having computer-executable instructions, which when executed by one or more processing devices, cause the one or more processing devices to perform: receiving handwriting input including handwritten mathematical symbols; receiving speech input including spoken words corresponding to spoken mathematical symbols; recognizing the handwriting input to identify candidate handwritten mathematical symbols; recognizing the speech input to identify candidate spoken words; processing the candidate handwritten mathematical symbols into a handwriting graph including nodes representing the candidate handwritten mathematical symbols and arcs representing probabilities that the candidate handwritten mathematical symbols are correct; processing the candidate spoken words into a speech graph by: accessing a lookup table with the candidate spoken words recognized from the speech input to identify candidate spoken mathematical symbols; and including nodes in the speech graph representing the candidate spoken mathematical symbols and arcs representing probabilities that the candidate spoken mathematical symbols identified from the lookup table are correct; and enhancing the handwriting graph into an enhanced graph by adjusting individual probabilities in the handwriting graph based on individual matching probabilities in the speech graph. 4. The one or more computer-readable storage devices of claim 1 having further computer-executable instructions which when executed by the one or more processing devices, cause the one or more processing devices to perform: outputting the enhanced graph from which a mathematical expression is computed.