 This mathematical understanding of infinity views it through the lens of transfinite arithmetic. Transfinite arithmetic presupposes that there are infinitely many natural numbers. According to transfinite arithmetic, the cardinal number of the set of natural numbers is \(\aleph_0\) (aleph-null). (A cardinal number is a number that can be used to answer the question “ How many?”) In other words, if it is asked “ How many natural numbers are there?”, the correct answer is \(\aleph_0\).