Buchholz psi functions (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Buchholz psi functions" in English language version.

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Jäger, G (1984). "ρ-inaccessible ordinals, collapsing functions and a recursive notation system". Archiv für Mathematische Logik und Grundlagenforschung. 24 (1): 49–62. doi:10.1007/BF02007140. S2CID 38619369.
Buchholz, W. (1986). "A new system of proof-theoretic ordinal functions". Annals of Pure and Applied Logic. 32: 195–207. doi:10.1016/0168-0072(86)90052-7.

Jäger, G (1984). "ρ-inaccessible ordinals, collapsing functions and a recursive notation system". Archiv für Mathematische Logik und Grundlagenforschung. 24 (1): 49–62. doi:10.1007/BF02007140. S2CID 38619369.