Title: वैकल्पिक

Text: The objects with which we usually operate in mathematics are called classes; they arise by abstraction from the intuitive notion of a collection of things. This intuitive image is unsatisfactory for mathematical operations because it gives rise to contradictions, so we must consider classes as defined by a determined system of axioms. We consider here the same system of axioms as in the book Universal Algebra, by P. M. Cohn. प्रत्येक पराग्राफले परीक्षण हुनेछ।

Save test: यदि तपाईं यो टाइपिङ परीक्षणलाई साझा गर्न चाहानुहुन्छ भने यो प्रयोग गर्नुहोस् (केवल प्रमाणीकृत प्रयोगकर्ताहरूको लागि)।