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About:
http://dbpedia.org/resource/System_L
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wikiPageExternalLink
http://gdz.sub.uni-goettingen.de/dms/resolveppn/%3FPPN=GDZPPN002375508
https://www.sfu.ca/~jeffpell/papers/pelletierNDtexts.pdf
http://gdz.sub.uni-goettingen.de/dms/resolveppn/%3FPPN=GDZPPN002375605%7Cdoi=10.1007/bf01201363
dbo:
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dbc
:Propositional_calculus
dbr
:Modus_tollens
dbr
:Natural_deduction
dbr
:Monotonicity_of_entailment
dbr
:Substitution_(logic)
dbr
:Deductive_system
dbr
:Sequent
dbr
:Gerhard_Gentzen
dbr
:Sequent_calculus
dbr
:Principle_of_explosion
dbr
:Context-free_grammar
dbr
:Patrick_Suppes
dbr
:Well-formed_formula
dbr
:Rule_of_inference
dbr
:John_Lemmon
dbr
:Natural_deductive_logic
dbr
:Reductio_Ad_Absurdum
dbr
:Modus_Ponendo_Ponens
gold:
hypernym
dbr
:Logic
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freebase
:m.0bh98g8
wikidata
:Q7663659
dbpedia-global
:4vJrs
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:System_L_(Lemmon)
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dbr
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