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[1] pp.142--143 Since the same variable symbol may appear in multiple places in an expression, some occurrences of the variable symbol may be free while others are bound, [1] p.78 hence "free" and "bound" are at first defined for occurrences and then generalized over all occurrences of said variable symbol in the expression. However it is done ...
SDM was developed in 1970 by a company known as PANDATA, now part of Cap Gemini, which itself was created as a joint venture by three Dutch companies: AKZO, Nationale Nederlanden and Posterijen, Telegrafie en Telefonie (Nederland). The company was founded in order to develop the method and create training materials to propagate the method.