the point of communication between two neurons-includes axon terminal of the sending neuron, the synaptic space (gap), and dendrites/cell body of the receiving neuron
There are two approaches to cardinality â one which compares sets directly using bijections and injections, and another which uses cardinal numbers. The cardinality of a set is also called its size, when no confusion with other notions of size is possible.
The cardinality of a set A is defined as its equivalence class under equinumerosity. A representative set is designated for each equivalence class. The most common choice is the initial ordinal in that class. This is usually taken as the definition of cardinal number in axiomatic set theory.