A Rich Cluster Contains Hundreds or Even Thousands of Galaxies,whereas

question 12

True/False

A rich cluster contains hundreds or even thousands of galaxies,whereas a poor cluster,often called a group,may contain a few dozen.

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Definitions:

Contrapositives

In logic, the contrapositive of a conditional statement is formed by negating both the hypothesis and the conclusion, and then reversing them.

Propositions

Statements in logic that can be either true or false but not both, serving as basic units of meaning and argumentation in deductive reasoning and logical analysis.

Obverse

A term often used in logic and mathematics, referring to the opposite or a counterpart of something.

Proposition

An expression or proclamation that signifies a belief or conclusion, which may be valid or not.