True or false: what circles can and cannot show

Exercise and reference answers

Questions

Statement is true
Yes
Statement
A diagram can show that two classes must overlap.
Statement is true
Yes
Statement
A diagram can show that two classes cannot overlap.
Statement is true
No
Statement
A diagram tells you how many members a class has.
Statement is true
Yes
Statement
A diagram can show that a conclusion does not follow.
Statement is true
No
Statement
A diagram adds information beyond the premises.

A diagram shows relations between classes, not their sizes. Source: Logic: Deductive and Inductive, Carveth Read (1898), public domain.