فرمت فایل : powerpoint (لینک دانلود پایین صفحه) تعداد صفحات 49 صفحه you cannot claim a statement to be true without assuming something which underlies that claim e.g. I cannot claim the proposition: 'the sky is blue' without assuming (or presupposing) the reliability of my senses, my use of language, grammar, logic, etc. مثال: اسمان ابی است پیش فرضها؟ مثال دیگر؟ ...