The Book of Lemmas or Book of Assumptions (Arabic Maʾkhūdhāt Mansūba ilā Arshimīdis) is a book attributed to Archimedes by Thābit ibn Qurra, though the authorship of the book is questionable. It consists of fifteen propositions (lemmas) on circles.[1]
The first page of the Book of Lemmas as seen in The Works of Archimedes (1897).
The Book of Lemmas was first introduced in Arabic by Thābit ibn Qurra; he attributed the work to Archimedes. In 1661, the Arabic manuscript was translated into Latin by Abraham Ecchellensis and edited by Giovanni A. Borelli. The Latin version was published under the name Liber Assumptorum.[2]T. L. Heath translated Heiburg's Latin work into English in his The Works of Archimedes.[3][4] A more recently discovered manuscript copy of Thābit ibn Qurra's Arabic translation was translated into English by Emre Coşkun in 2018.[5]
The original authorship of the Book of Lemmas has been in question because in proposition four, the book refers to Archimedes in third person; however, it has been suggested that it may have been added by the translator.[6] Another possibility is that the Book of Lemmas may be a collection of propositions by Archimedes later collected by a Greek writer.[1]
Archimedes first introduced the arbelos (shoemaker's knife) in proposition four of his book:
If AB be the diameter of a semicircle and N any point on AB, and if semicircles be described within the first semicircle and having AN, BN as diameters respectively, the figure included between the circumferences of the three semicircles is "what Archimedes called αρβηλος"; and its area is equal to the circle on PN as diameter, where PN is perpendicular to AB and meets the original semicircle in P.[1]
The figure is used in propositions four through eight. In propositions five, Archimedes introduces the Archimedes's twin circles, and in proposition eight, he makes use what would be the Pappus chain, formally introduced by Pappus of Alexandria.
Archimedes first introduced the salinon (salt cellar) in proposition fourteen of his book:
Let ACB be a semicircle on AB as diameter, and let AD, BE be equal lengths measured along AB from A, B respectively. On AD, BE as diameters describe semicircles on the side towards C, and on DE as diameter a semicircle on the opposite side. Let the perpendicular to AB through O, the centre of the first semicircle, meet the opposite semicircles in C, F respectively. Then shall the area of the figure bounded by the circumferences of all the semicircles be equal to the area of the circle on CF as diameter.[1]
Archimedes proved that the salinon and the circle are equal in area.
Propositions
If two circles touch at A, and if CD, EF be parallel diameters in them, ADF is a straight line.
Let AB be the diameter of a semicircle, and let the tangents to it at B and at any other point D on it meet in T. If now DE be drawn perpendicular to AB, and if AT, DE meet in F, then DF = FE.
Let P be any point on a segment of a circle whose base is AB, and let PN be perpendicular to AB. Take D on AB so that AN = ND. If now PQ be an arc equal to the arc PA, and BQ be joined, then BQ, BD shall be equal.
If AB be the diameter of a semicircle and N any point on AB, and if semicircles be described within the first semicircle and having AN, BN as diameters respectively, the figure included between the circumferences of the three semicircles is "what Archimedes called αρβηλος"; and its area is equal to the circle on PN as diameter, where PN is perpendicular to AB and meets the original semicircle in P.
Let AB be the diameter of a semicircle, C any point on AB, and CD perpendicular to it, and let semicircles be described within the first semicircle and having AC, CB as diameters. Then if two circles be drawn touching CD on different sides and each touching two of the semicircles, the circles so drawn will be equal.
Let AB, the diameter of a semicircle, be divided at C so that AC = 3/2 × CB [or in any ratio]. Describe semicircles within the first semicircle and on AC, CB as diameters, and suppose a circle drawn touching the all three semicircles. If GH be the diameter of this circle, to find relation between GH and AB.
If circles are circumscribed about and inscribed in a square, the circumscribed circle is double of the inscribed square.
If AB be any chord of a circle whose centre is O, and if AB be produced to C so that BC is equal to the radius; if further CO meets the circle in D and be produced to meet the circle the second time in E, the arc AE will be equal to three times the arc BD.
If in a circle two chords AB, CD which do not pass through the centre intersect at right angles, then (arc AD) + (arc CB) = (arc AC) + (arc DB).
Suppose that TA, TB are two tangents to a circle, while TC cuts it. Let BD be the chord through B parallel to TC, and let AD meet TC in E. Then, if EH be drawn perpendicular to BD, it will bisect it in H.
If two chords AB, CD in a circle intersect at right angles in a point O, not being the centre, then AO2 + BO2 + CO2 + DO2 = (diameter)2.
If AB be the diameter of a semicircle, and TP, TQ the tangents to it from any point T, and if AQ, BP be joined meeting in R, then TR is perpendicular to AB.
If a diameter AB of a circle meet any chord CD, not a diameter, in E, and if AM, BN be drawn perpendicular to CD, then CN = DM.
Let ACB be a semicircle on AB as diameter, and let AD, BE be equal lengths measured along AB from A, B respectively. On AD, BE as diameters describe semicircles on the side towards C, and on DE as diameter a semicircle on the opposite side. Let the perpendicular to AB through O, the centre of the first semicircle, meet the opposite semicircles in C, F respectively. Then shall the area of the figure bounded by the circumferences of all the semicircles be equal to the area of the circle on CF as diameter.
Let AB be the diameter of a circle., AC a side of an inscribed regular pentagon, D the middle point of the arc AC. Join CD and produce it to meet BA produced in E; join AC, DB meeting in F, and Draw FM perpendicular to AB. Then EM = (radius of circle).[1]
References
^ abcdeHeath, Thomas Little (1897), The Works of Archimedes, Cambridge University: University Press, pp. xxxii, 301–318, retrieved 2008-06-15
^. Brown University. Archived from the original on 2008-02-24. Retrieved 2008-06-24.
^Aaboe, Asger (1997), Episodes from the Early History of Mathematics, Washington, D.C.: Math. Assoc. of America, pp. 77, 85, ISBN0-88385-613-1, retrieved 2008-06-19
^Glick, Thomas F.; Livesey, Steven John; Wallis, Faith (2005), Medieval Science, Technology, and Medicine: An Encyclopedia, New York: Routledge, p. 41, ISBN0-415-96930-1, retrieved 2008-06-19
^Coşkun, Emre (2018). "Thābit ibn Qurra's Translation of the Maʾkhūdhāt Mansūba ilā Arshimīdis" (PDF). SCIAMVS: Sources and Commentaries in Exact Sciences. 19: 53–102.
^Bogomolny, A. "Archimedes' Book of Lemmas". Cut-the-Knot. Retrieved 2008-06-19.
January 26, 2023
book, lemmas, book, assumptions, arabic, maʾkhūdhāt, mansūba, ilā, arshimīdis, book, attributed, archimedes, thābit, qurra, though, authorship, book, questionable, consists, fifteen, propositions, lemmas, circles, first, page, seen, works, archimedes, 1897, co. The Book of Lemmas or Book of Assumptions Arabic Maʾkhudhat Mansuba ila Arshimidis is a book attributed to Archimedes by Thabit ibn Qurra though the authorship of the book is questionable It consists of fifteen propositions lemmas on circles 1 The first page of the Book of Lemmas as seen in The Works of Archimedes 1897 Contents 1 History 1 1 Translations 1 2 Authorship 2 New geometrical figures 2 1 Arbelos 2 2 Salinon 3 Propositions 4 ReferencesHistory EditTranslations Edit The Book of Lemmas was first introduced in Arabic by Thabit ibn Qurra he attributed the work to Archimedes In 1661 the Arabic manuscript was translated into Latin by Abraham Ecchellensis and edited by Giovanni A Borelli The Latin version was published under the name Liber Assumptorum 2 T L Heath translated Heiburg s Latin work into English in his The Works of Archimedes 3 4 A more recently discovered manuscript copy of Thabit ibn Qurra s Arabic translation was translated into English by Emre Coskun in 2018 5 Authorship Edit See also Pseudo Archimedes The original authorship of the Book of Lemmas has been in question because in proposition four the book refers to Archimedes in third person however it has been suggested that it may have been added by the translator 6 Another possibility is that the Book of Lemmas may be a collection of propositions by Archimedes later collected by a Greek writer 1 New geometrical figures EditThe Book of Lemmas introduces several new geometrical figures Arbelos Edit Main article Arbelos The arbelos is the shaded region grey Archimedes first introduced the arbelos shoemaker s knife in proposition four of his book If AB be the diameter of a semicircle and N any point on AB and if semicircles be described within the first semicircle and having AN BN as diameters respectively the figure included between the circumferences of the three semicircles is what Archimedes called arbhlos and its area is equal to the circle on PN as diameter where PN is perpendicular to AB and meets the original semicircle in P 1 The figure is used in propositions four through eight In propositions five Archimedes introduces the Archimedes s twin circles and in proposition eight he makes use what would be the Pappus chain formally introduced by Pappus of Alexandria Salinon Edit Main article Salinon The salinon is the blue shaded region Archimedes first introduced the salinon salt cellar in proposition fourteen of his book Let ACB be a semicircle on AB as diameter and let AD BE be equal lengths measured along AB from A B respectively On AD BE as diameters describe semicircles on the side towards C and on DE as diameter a semicircle on the opposite side Let the perpendicular to AB through O the centre of the first semicircle meet the opposite semicircles in C F respectively Then shall the area of the figure bounded by the circumferences of all the semicircles be equal to the area of the circle on CF as diameter 1 Archimedes proved that the salinon and the circle are equal in area Propositions EditIf two circles touch at A and if CD EF be parallel diameters in them ADF is a straight line Let AB be the diameter of a semicircle and let the tangents to it at B and at any other point D on it meet in T If now DE be drawn perpendicular to AB and if AT DE meet in F then DF FE Let P be any point on a segment of a circle whose base is AB and let PN be perpendicular to AB Take D on AB so that AN ND If now PQ be an arc equal to the arc PA and BQ be joined then BQ BD shall be equal If AB be the diameter of a semicircle and N any point on AB and if semicircles be described within the first semicircle and having AN BN as diameters respectively the figure included between the circumferences of the three semicircles is what Archimedes called arbhlos and its area is equal to the circle on PN as diameter where PN is perpendicular to AB and meets the original semicircle in P Let AB be the diameter of a semicircle C any point on AB and CD perpendicular to it and let semicircles be described within the first semicircle and having AC CB as diameters Then if two circles be drawn touching CD on different sides and each touching two of the semicircles the circles so drawn will be equal Let AB the diameter of a semicircle be divided at C so that AC 3 2 CB or in any ratio Describe semicircles within the first semicircle and on AC CB as diameters and suppose a circle drawn touching the all three semicircles If GH be the diameter of this circle to find relation between GH and AB If circles are circumscribed about and inscribed in a square the circumscribed circle is double of the inscribed square If AB be any chord of a circle whose centre is O and if AB be produced to C so that BC is equal to the radius if further CO meets the circle in D and be produced to meet the circle the second time in E the arc AE will be equal to three times the arc BD If in a circle two chords AB CD which do not pass through the centre intersect at right angles then arc AD arc CB arc AC arc DB Suppose that TA TB are two tangents to a circle while TC cuts it Let BD be the chord through B parallel to TC and let AD meet TC in E Then if EH be drawn perpendicular to BD it will bisect it in H If two chords AB CD in a circle intersect at right angles in a point O not being the centre then AO2 BO2 CO2 DO2 diameter 2 If AB be the diameter of a semicircle and TP TQ the tangents to it from any point T and if AQ BP be joined meeting in R then TR is perpendicular to AB If a diameter AB of a circle meet any chord CD not a diameter in E and if AM BN be drawn perpendicular to CD then CN DM Let ACB be a semicircle on AB as diameter and let AD BE be equal lengths measured along AB from A B respectively On AD BE as diameters describe semicircles on the side towards C and on DE as diameter a semicircle on the opposite side Let the perpendicular to AB through O the centre of the first semicircle meet the opposite semicircles in C F respectively Then shall the area of the figure bounded by the circumferences of all the semicircles be equal to the area of the circle on CF as diameter Let AB be the diameter of a circle AC a side of an inscribed regular pentagon D the middle point of the arc AC Join CD and produce it to meet BA produced in E join AC DB meeting in F and Draw FM perpendicular to AB Then EM radius of circle 1 References Edit a b c d e Heath Thomas Little 1897 The Works of Archimedes Cambridge University University Press pp xxxii 301 318 retrieved 2008 06 15 From Euclid to Newton Brown University Archived from the original on 2008 02 24 Retrieved 2008 06 24 Aaboe Asger 1997 Episodes from the Early History of Mathematics Washington D C Math Assoc of America pp 77 85 ISBN 0 88385 613 1 retrieved 2008 06 19 Glick Thomas F Livesey Steven John Wallis Faith 2005 Medieval Science Technology and Medicine An Encyclopedia New York Routledge p 41 ISBN 0 415 96930 1 retrieved 2008 06 19 Coskun Emre 2018 Thabit ibn Qurra s Translation of the Maʾkhudhat Mansuba ila Arshimidis PDF SCIAMVS Sources and Commentaries in Exact Sciences 19 53 102 Bogomolny A Archimedes Book of Lemmas Cut the Knot Retrieved 2008 06 19 Retrieved from https en wikipedia org w index php title Book of Lemmas amp oldid 1127501102, wikipedia, wiki, book, books, library,
