1. A computer-implemented method of extracting a mathematical structure representation of a digital version of a financial table associated with a financial document using a document processing system including a memory and a processor communicatively coupled to the memory for performing the method, the method comprising: a) detecting a financial table included in the financial document, the financial table including a plurality of line items organized in columns and rows, each line item associated with a row and one or more columns, each row including a value label associated with a first column and a respective value associated with a second column; b) extracting a first value associated with the second column; c) shifting the extracted first value to a top location of a LR-(Left-to-Right) parser reducing stack and shifting the extracted first value to a top location of a nonreducing stack; d) extracting a second value associated with the second column; e) shifting the extracted second value to the top location of the LR-parser reducing stack directly above the first value, and shifting the extracted second value to the top location of the nonreducing stack directly above the first value; f) determining if the second value shifted to the top location of the LR-parser reducing stack is a sum of any sequential preceding values below in the LR-parser reducing stack or nonreducing stack and if the second value shifted to the top location of the LR-parser reducing stack is a sum of any sequential values below in the LR-parser reducing stack or nonreducing stack, eliminating the sequential preceding values below in the LR-parser reducing stack which provide the sum and retaining the second value shifted to the top location of the LR-parser reducing stack which is the sum, while retaining all sequential preceding values below in the nonreducing stack; g) repeating steps d)-f) for all sequential values included in the second column of the financial table to generate a final LR-parser reduced stack; and h) processing the final reducing stack to generate a mathematical structure associated with the second column.