Set of Finite Character with Countable Union is Type M/Proof 2/Historical Note

Historical Note on Proof $2$ of Set of Finite Character with Countable Union is Type $M$

According to Smullyan and Fitting, this proof was put in place by Adolf Lindenbaum.

This was reported by Alfred Tarski in $1930$.

Sources

• 1930: Alfred Tarski: Über einige fundamentale begriffe der metamathematik (Sprawozdania z Posiedzeń Towarzystwa Naukowego Warszawskiego. Wydział III Vol. 23: pp. 22 – 29)

• 2010: Raymond M. Smullyan and Melvin Fitting: Set Theory and the Continuum Problem (revised ed.) ... (previous) ... (next): Chapter $4$: Superinduction, Well Ordering and Choice: Part $\text {II}$ -- Maximal principles: $\S 6$ Another approach to maximal principles