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36
ChapterI
tionedshorttreatises(opuscula)onlocalmotionascribedtoSwineshead,
astheseclearlyshowthecontinuityofthedevelopmentoftheOxford
Calculatorsscienceofmotion.77Thereasoningsandconclusionsin-
cludedintheseopusculaletusseethesetextsastheintermediateusteps”
betweenWilliamHeytesbury’sstatementsfromthesectionDemotulo-
caliofhisuRulesforsolvingsophisms”andthetreatiseDemotulocali
ofRichardSwineshead’suBookofcalculations”.Certainsolutionsand
rulesweencounterintheseshorttreatiseshelpusalsotounderstand
somespecifcfeaturesofRichardSwineshead’saccomplishment.
77Thecriticaleditionoftheseshorttreatisesaccompaniedwithadetailedpresen-
tationhasbeenpublishedrecently(seeR.Podkoński,RichardSwineshead)sscience
ofmotion,Łódź2019).