Russell (1961: 638):
Algebra and arithmetic are the only sciences in which we can carry on a long chain of reasoning without losing certainty. Geometry is not so certain as algebra and arithmetic, because we cannot be sure of the truth of its axioms.
Blogger Comments:
From the perspective of Systemic Functional Linguistic Theory, a long chain of reasoning in algebra or arithmetic is a sequence of iterated elaborations of an initial identifying figure — an equation— that is, textually, a message and, interpersonally, an unmodalised proposition.
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