Definition:Class/Also defined as

Class: Also defined as

In earlier works which date from before rigorous class theoretical attempts to formalise set theory, the word class is often used as a synonym for set, with no attempt made to distinguish between two different concepts.

Sources

• 1939: E.G. Phillips: A Course of Analysis (2nd ed.) ... (previous) ... (next): Chapter $\text {I}$: Number: $1.2$ Fundamental notions