De USU SOBIRACTIONIS ETC, 541 



(L)[l(')-H...!^1(-+/)]=[l(')H-.".H-l(-)l+-[l(i)-fr~-4-l(')].[l(')^...-Hl(-)] 



Jl(i)-t!!7.-f-1(^)].[l(')-t-...-Hl(/)] 



^1 ( 1 )^_...^-1 (-)] . [l ( < )-i!I_h1 )]_h[i ( ' )h- .'.'.-1-1 Oil 

 Sed ol) acqiiationcm (E) n.' 10.' §.' II.' scrihl potcril 



[l (i)_H . . . _h1 ("-hOJ pro [l (')-H ■ • ■ -*-1 <'-*-.^)J; 

 ita loco 



[l(0-f-.''..H-lw] ponatur [kD-hI-hK"-^')] ; 

 itemque 



[■l(i)-t- . . .-I-K")] substilualiir pro [l(')-4- . . . -4-1(^)j , 

 el ita porro . Eodeni pacto agalur quoad 



[l(i)-H . . .-H1(.')] , [l(')-H . . .-f-K-')] , 



c'l caetera;elideo post has transformationcs aequalio scqueus profliiet 



(M) [l O-f-^T^-Hl ("-*-')]=Ll (')-(- !'. . -1-1 ("+1)] 



_t-[l (')-4-'7. H-1 (")] . [l cCl (^)] 

 _h[i(')^ .'T^1("-i)] .[l(0-(-1(2)-t-1<3)] 



-t_[l ( I )Vl (2)] . [l (I ) -+-■'. . . _h1 (") ] 



-t-[l (')-!-. '^.-+-1 ("+')]. 

 Hie in primis, anlequam praetergrediamur, nolandiim erit. « Nu- 

 n merum {^-^-y) """"'" figiiratnm ordinis (/?-»-l)"""' esse 

 « summain productorum , quae colliguntur hi numeri figurali 

 " bini muUiplicenUir ahernatim ex indicibus .r, i\c y constau- 

 « ler deiiolati , el ex ordiuihiis successivis, qui praeceduiil, 

 « usque ad (n-H-1 )<■""""" inclusive desumpii. » 



Exempli causa numeru'^ figuratus decinius quinli ordiiiis ad- 

 aequal sextum nunieruui figuratum quinti ordinis niultiplica- 



