A set is countable if: (1) it is finite, or (2) it has the same cardinality (size) as the set of natural numbers. Equivalently, a set is countable if it has the same cardinality as some subset of the set of natural numbers.Otherwise, it is uncountable.heorem: The set of all finite subsets of the natural numbers is countable. If you have a finite subset, you can order the elements into a finite sequence. There are only countably many finite sequences, so also there are only countably many finite subsets.
Rhinitis: Introduction. Rhinitis: Nasal lining inflammation leading to runny/blocked nose. More detailed information about the symptoms, causes, and treatments of Rhinitis is available below. Symptoms of Rhinitis
Hay Fever and Allergic Rhinitis. Rhinitis is inflammation of the nose, which is recognised by symptoms such as sneezing, runny nose, blocked / stuffy nose, itching and 'post-nasal drip' (the sensation of mucus running down the back of the throat). It can occur in association with inflammation of the eyes or sinuses.