Final answer:
The set A = {σ,{σ}} consists of two distinct elements, so its cardinality is 2.
Step-by-step explanation:
To find the cardinality of the set A = {σ,{σ}}, we will count the number of distinct elements in the set. In this set, there are two elements. The first element is 'σ', and the second element is '{σ}', which is a set containing 'σ' as its element. Since there are two distinct elements, the cardinality of set A is 2.