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# Title: [Johannis Wallis S. T. D. Geometriae Professoris Saviliani, in Celeberrima Academia Oxoniensi, De Algebra Tractatus; Historicus & Practicus. Anno 1685 Anglice editus; Nunc Auctus Latine. Cum variis Appendicibus; Partim prius editis Anglice, Partim nunc primum editis] Johannis Wallis S. T. D. Geometriæ Professoris Saviliani, in Celeberrima Academia Oxoniensi, De Algebra Tractatus; Historicus & Practicus. Anno 1685 Anglice editus; Nunc Auctus Latine. Cum variis Appendicibus; Partim prius editis Anglice, Partim nunc primum editis (shelfmarks Leibn. Marg. 100:1/2, Stück 2; Leibn. Marg. 100:1/2)
# Folio 92, page id 851708439:0116
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 Y. G F B R A.
LidP. L1
vero - = = ; hoc est B, P = . : A. a. Pariterque a. B =;: A. B. F simulicer in alis
Inversontous.
Tlem; DEOpter AB = a. B, adeoque a B = AB; dixitis utrisque Per AB, erit
L =; hoc est a. A =: : P. B: Oux est Tuversio. Paricerque ( dirisis cildem
per a A )eric B. A L:: P. c. ( in
B
vat A
Sup B
Et Componendo, leu Dividendo; Propter - = -, adeoque = + 1 = - + L seu
A F a BLB
; eic A F a. a =:: B + B. 8.
e B
ss ta ss c
.Cesc
Cumque sic (invercendo) - = =; adeoque r. f = = 1 + =, C propter mi-
A F ∞ B F B
A
adsit B
nus additum) teu  = - = hoc est A + a. A =: : B. + B. B: erit (ile
rum invercendo) A. A F a =:: B. B. F B. Oux est Conversio rationis per viam
Compositionis.
COntrA verO; 2 = = = L =- (propier minus ablacum,) seu -- =
hoc est A - e. A =:: B  B. B: iterumque invertendo, A. A = a : : B. B -- B.
Oux est Conversiorationis per viam Divisionis.
Cumque GC (per convertionem rationis - -- =   ; _ C per inversam
 sC) ett s sit si um e. :al et si (A + a B  B
compositxe) -- = --: F.ric (Propter minus ablatum d majori COcO) Retiduum
A f a B FB
5
A F B. L B
Hoc est A - a. A f a = :: B = B. B F B. F. L (invertendo) A. + a
=:: B. +. B. B - 6
Hoc est; Si FE A
Alternando A.
Invercendo Z.
Componendor a ta
Rric L Fc dividendos A +B
A.
Convertendo ) A. A
c
B
a - B
.. B. B
:: a. a = 1
B. B
C
Mixrim
:: d. a - b
A +a. A- a -:: B LB. B B
EA F B. A BC:: a+B. a
Ft parsex in rellquis; quod inquirenris sagacicas facile inveltixabic: VE nOn SiE
opus id lingulatim ostendere.
Sed nec alios iridem arxumentandi modos (ab his deriratos) opus erie parrieu-
lacim ostendere: Sultieir urique eos enumerasse qui lunc praecipui, ee Frequentioris
utus. Paucos tamen ab Ouehcredo tradicos libet hic subjunsere; qui praecedenti
schemati non commode ilererentur.
Si quodibet magnitudines lint proportionales, (Puca L. . . b. .. l. 3: :d.
_cC.) eriu ut unus antecedens, ad suum consequenrem; sic lumma anrecedemtium
ad summam consequentium. Puca A. a:: A FB f C F D etc. 8 f B. + y + d dc.
quoreunque tuexin.
Nami
:: 8.
:: B. B
=:: B +B
+B