An electrocardiogram (ECG) is a test which measures the electrical activity of your heart to show whether or not it is working normally. An ECG records the heartâs rhythm and activity on a moving strip of paper or a line on a screen.
The term compact is most often applied to agreements among states or between nations on matters in which they have a common concern. The Constitution contains the Compact Clause, which prohibits one state from entering into a compact with another state without the consent of Congress.
A subset of the real line is compact if and only if it is both closed and bounded. This implies the following generalization of the extreme value theorem: a continuous real-valued function on a nonempty compact space is bounded above and attains its supremum. Slightly more generally, this is true for an upper semicontinuous function. (see compact space#Functions and compact spaces).