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+The Feferman–Schütte Ordinal ($\Gamma_0$) is a large [countable ordinal](/wiki/Countable_Ordinal) that delineates the strength of powerful mathematical theories. It marks the limit of constructive proofs within certain [proof theory](/wiki/Proof_Theory) systems, a profound boundary in logic.
+## See also
+- [Ordinal Number](/wiki/Ordinal_Number)
+- [Peano Arithmetic](/wiki/Peano_Arithmetic)
+- [Formal System](/wiki/Formal_System)
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