Does two and two equal four? Ask someone and they should answer yes. An equation such as this seems the very definition of certainty, but is it? Helen Verran describes how she went from the conclusion that logic and maths are culturally relative, to a new understanding of all generalizing logic.
                        
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                                                                Does two and two equal four? Ask someone and they should answer yes. An equation such as this seems the very definition of certainty, but is it? Helen Verran describes how she went from the conclusion that logic and maths are culturally relative, to a new understanding of all generalizing logic.
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