Set Theory Set Theory is a branch of mathematics in which we study about sets and their properties. Georg Cantor (1845-1918), a German mathematician, initiated the concept ‘Theory of sets’ or ‘Set Theory’. He was working on “ Problems on Trigonometric Series ” when he encountered something that had become the most fundamental thing in mathematics. Set theory is the fundamental theory in mathematics. Without sets, it is not possible to explain relations, functions, sequences, probability, geometry etc. Apart from this, Cantor also conceptualized that some of the infinities are countable and others are uncountable. He introduced the fact that the uncountable infinite set of real numbers is larger than the countable infinite set of integers. This is known as Cantor’s diagonal argument. Let us now go ahead and learn the meaning of sets in maths. Sets: To understand sets, consider a practical scenario. While going to school from home, Nivy decided to note down the ...