In my master's thesis, I will present ordinal and cardinal numbers. I will start with some basic definitions and theorems of set theory. These will help us understand the concepts that will follow. I will also present the Zermelo-Fraenkl axiomatic system and the axiom of choice. A few words will be devoted to the natural numbers and their interpretation within set theory. An important role will be played by well-ordered sets and order on the sets, which will be presented next. The central part of the master's thesis will be the interpretation of ordinal and cardinal numbers.
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