Define the fourth heart sound. It is heard right before S1 late in diastole and sounds like ventricular filling. Sounds like da LUB-dub. It can be heard on the apex in the left lateral position. It is normal in people over the age of 40-50. Usually heard after exercise with no CV disease. Abnormal sounds like an atrial gallop.
Define subset. subset synonyms, subset pronunciation, subset translation, English dictionary definition of subset. n. A set contained within a set. n 1. maths a. a set the members of which are all members of some given class: A is a subset of B is usually written AâB b.... Subset - definition of subset by The Free Dictionary
The complement of a set A (denoted by Aâ) is the set of elements which are not in set A. Hence, A' = {x | x â A}. More specifically, A'= (U â A) where U is a universal set which contains all objects. Cartesian Product / Cross Product. The Cartesian product of n number of sets A1, A2 .....An, defined as A1 Ã A2 Ã.....