Barrow, Isaac
,
Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur
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<
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DK. </
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<
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157.</
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adverſas reperientur, facto AB - {R/I} AC. </
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I. </
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{R/I} AC - AB. </
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A cadat inter B, & </
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fiat I. </
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