818 HENRY SOTHEKAN & CO., 140, STRAND, W.C., AND 43, PICCADILLY, W. 



MATHEMATICS, continued: 



16286 LE COINTE (Igrnace Louis Alfred, s j.) LECONS sur la THEORIE des FONCTIONS CIRCU- 

 LAIRES et la TRIGONOMETRIE ; with diagrams, 8vo. hf. maroon morocco neat (as good as new), 

 3s 6d 1858 



16287 LEFEBURE de FOURCY (Louis Etienne) LECONS d'ALGEDRE, 10 e [derniere] Edition, 

 Svo. hf. black morocco neat, cL sides, t. e. g. (as good as new), 5s (p. F. 7.50 nett sewn) 1893 



16288 - TRAITE de GEOMETRIE DESCRIPTIVE, avec Introduction renfennant la Theorie du Plan 

 et de la Ligne Droite consideree dans 1'Espace, 8 e [derniere] Edition ; with 34 folding plates (all 

 neatly LINEN-MOUNTED), Svo. handsomely bound in hf. blaik morocco, cl. sides, uncut, t. e. g. 

 (nice copy) ; o. p., 8s Gd 1881 



16289 LEGENDRE (Adrien Marie; F.R.S.), ELEMENTS de GEOMETRIE, avec Additions et Modifi- 

 cations par A. BLANCHET, 39 e [derniere] Edition ; with numerous diagrams, Svo. buckram, 3s s. d. 



16290 - THEORIE des NOMBRES, 3 e [LA MEILLEURE] EDITION [avec Appendice : Metliodes 

 nouvelles pour la Resolution Approche'e des Equations Nuraeriques, etc. etc.] ; with folding plate, 

 2 vols. 4to. hf. calf gilt (NICE COPY) ; VERY RARE, 2. 15s Didot, 1830 



THE BEST EDITION, NOW EXCESSIVELY SCARCE. 'The third edition, issue! in 1830, includes the results of his various 

 later papers, and still remains a standard work on the subject. It may b^s said that he here carried the subject as far 

 as was possible by the application of ordinary algebra. . . . The law of quadratic reciprocity, which connects any two odd 

 primes, was first proved in this book. Gauss called the proposition ' the gem of arithmetic.' . . . The svork also contains 

 the useful theorem by which, when it is possible, an indeterminate equation of the 2nd degree can be reduced to the form 

 o:W. W. R. Ball. 



16291 - ZAHLENTIIEORIE, nach der 3. Auflage ins Deutsche iibertragen von H. MASER, 2. 

 wohlfeile Ausgabe, 2 vols. roy. Svo. in 1, buckram, 9s (p. M. 12 sewn) Leipzig, 1893 



16292 LEJEUNE-DIRICHLET (Peter Gustav; Univ. Gottingen) VORLESUNGEN iiber ZAHLEN- 

 THEORIE, herausgegeben v. R. DEDEKIND, 2. umgearbeitete Auflage, 8v. hf. cl., 3s 6d 



Braunschweig, 1871 



16293 - - VlERTE [NEUESTE] UMGEARBEITETE UND VERMEHRTE AUFLAGE, 8vO. hf. red morocco 



neat, cl. sides (nice copy) ; o. p., 16s ibidem, 1894 



1 Of his original researches the most celebrated are that on the establishment of Fourier's Theorem, and that in the theory 

 of numbers on asymptotic laws, i.e. laws which approximate more closely to accuracy as the numbers concerned become 

 larger.' fF. W. R. hall. 



16294 LEROY (Charles Francois Antoine, de I'rfcole Poly technique) TRAITE de GEOMETRIE DE- 

 SCRIPTIVE, suivi de la Methode des Plans cotes et de la Theorie des Engrenages cylindriques et 

 coniques ; 13 e Edition, revue et annote'e par E. MARTELET ; with Atlas, containing 1 1 plates, 2 vols. 

 4to. hf. maroon morocco neat, cl. sides, uncut, t. e. g. (as good as new], 10s Qd (p. F. 16 nett sewn) 1888 



16295 - TRAITE de STEREOTOMIE, comprenant les Applications de la Geometric descriptive a la 

 Theorie des Ombres, la Perspective lineaire, la Gnomonique, la Coupe des Pierres et la Charpente ; 

 l'2 e Edition, revue et annotee par E. MARTELET, avec SUPPLEMENT : Theorie et Construction de 

 1'Appareil he'licoidal des Arches biaises, par JULES DE LA GOURNERIE, redigees par ERNEST 

 LEBON, 4to., with Atlas, containing 76 plates, folio 2 vols., hf. maroon morocco neat, cl. sides, 

 uncut, t. e. g. (fine copy), 18s (p. F. 26 nett sewn) 1890 



16296 LIE (Marius Sophus ; Prof. Geometry, Leipzig) GEOMETRIE der BERUHRUNGSTRANSFORMA- 

 TIONEN, dargestellt von SOPHUS LIE und GEORG SCHEFFERS, I. [einziger] Band ; with diagrams, 

 Svo. handsomely bound in hf. black morocco, cl. sides (as good as new), 18s (p. M. 24 sewn) 



Leipzig, 1896 



16297 - VORLESUNGEN iiber CONTINUIERLICHE GRUPPEN, mit geometrischen und anderen 

 Anwendungen, bearbeitet und herausgegeben von GEORG SCHEFFERS ; with diagrams, large Svo. 

 handsomely bound in hf. pigskin, cl. sides (fine copy), 18s (p. M. 24 sewn) ibidem, 1S93 



16298 - , und Friedrich ENGEL; Prof. Mathematics, Greifswald: THEORIE der TRANS- 

 FORMATIONSGRUPPEN, 3 vols. large 8vo. handsomely bound in hf. red morocco, cl. sides (fine copy), 

 2. 55 (p. M. 60 sewn) ib., 1888-93 



'The finite continuous groups were first made the subject of general research by Sophus Lie, and applied by him to 

 the integration of ordinary linear partial differential equations.' Prof. Cajuri. 



16299 LIBBER (H.), und F. v. LtJHMANN : TRIGONOMETRISCHE AUFGABEN, 3. [letzte] 

 Auflage ; with folding plate, Svo. red buckram, 3s (p. M. 4 sewn) Berlin, 1889 



16300 LIEBLEIN (Johann) SAMMLUNG von AUFGABEN aus der ALGEBRAISCHEN ANALYSIS xum 

 Selbstunterricht ; 2. [letzte] vermehrte Auflage, herausgegeben von W. LASKA, Svo. buckram, 3s 

 (p. M. 4.50 sewn) Prag, 1889 



16301 LIEBMANN (Heinrich, Univ. Leipzig) NICHTEUKLIDISCHE GEOMETRIE ; with 22 diagrams, 

 large cr. Svo. cl., or, buckram, 4s (p. M. 6.50) Leipzig, 190 > 



16302 LIQOWSKI (W.) TASCHENBUCH der MATHEMATIK : Tafeln und Formeln, 3. [neueste] 

 vermehrte Auflage ; with woodcuts, post Svo. buckram, 2s Qd (p. M. 3 50) Berlin, 1893 



Last edition of this excellent manual of mathematical formulae. 



16303 LILIENTHAL (Franz Beinhold v. ; Prof. Mathematics, Miinster) GRUNDLAGEN einer 

 KRUMMUNGSLEHRE der CURVENSCHAREN, roy. Svo. buckram, 4s (p. M. 5 sewn) Leipzig, 1896 



16304 - \ r ORLESUNGEN iiber DIFFERENTIALGEOMETRIE, Band I und II. 1 [soweifc bisher 

 erschienen] ; with diagrams, 2 vols. Svo. in 1, handsomely bound in hf. black morocco, cl. sides, 

 t. e. g., Us (p. M. 23 sewn) ibidem, 1908-13 



