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