Jordanus de Nemore, [Liber de ratione ponderis], 1565

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                termine breuioris, siue in sectione dependens, uel etiam duo pon
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                dera data alterum in termino, alterum insectione appensa, re­
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                gulam in aequedistantiam constituant, ipsa quoque in pondere
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                data erit.
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                Esto ut prius regula a, b, c, sitque
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                a, b, ad c, b, datur in proportio­
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                ne appendaturque pondus d, ela
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                tum aequabiliter ex parte c, duo ergo
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                a, b, c, datam esse in pondere. </s>
                <s id="id.2.19.02.02">Ponatur
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                enim ipsa alicuius noti ponderis quod
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                diuidatur secundum proportionem a,
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                b, a, d, et c, b, ponaturque maius a, b,
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                et minus e, b, et secundum hoc inue­
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                nietur pondus d. </s>
                <s id="id.2.19.02.03">sicut ergo se habet pon
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                dus d, prius sumptum ad posterius sum
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                ptum, ita se habebit pondus a, b, c, ad
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                pondus positum. </s>
                <s id="id.2.19.02.04">Si enim maius, uel
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                minus, et t, similiter maius, uel minus
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                quám positum est, erit quód si, d, in e
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                dependeat, et data sit c, b, ad e, b, da
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                tum erit, et t, aequaliter pendens a, c,
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                quód si d, et h, data sint, similiter et
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                t, datum erit. quod quoniam datum
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                est, datum erit pondus a, b, c.</s>
                <s id="id.2.19.02.05">Commen
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                tum respicit prius schema praecedentis
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                propositionis.
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                Quaestio decimanona.
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                <s id="id.2.20.01.01">Si responsa dati ponderis per
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                inaequalia diuidatur, et alter mi
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                nus ipsius data pondera appen
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                dantur, quae in aequalitate con­
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                sistant, brachia quoque librae a
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                centro, examinis data erunt.
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                </s>
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                <s id="id.2.20.02.01">Verbi gratia, dependeat ex a pon
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                dus d, et a, c, pondus utrunque
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                et sit b, z, aequalis b, c, et diui</s>
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