Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences, fol. -
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The machine reads it as
- Thus, luppole
- 0. 2. 4: 6. 8. 10. 12. 14. 16. 18, 2a
- Thus, in che Collomins Series,
- a. a X. a 2. X. a l- 3X. a 1 4X. 5 ( 5X. a1
- a -] 7X. a dd. a Gt. d TO.
- The Sum of che Fxrremes 2 a = = 1OX, is equal
- 10 = a -) 5 X mulciplicd bY 2; thar is, the Double
- oF the Midale Perm: AS ic is allo ro the Sum ot
- any Trvo oF ehem equallr distane trom boch RX
- tremes.
- And ehis must erer be, because the last Perm
- contains in icphe trst, and also che common Diste
- rence super-added as otcen a5 che NTumber oE its
- Place is distane from che Arst Perm: Bur, the ArA
- Term hach no Aadirion of che Ditterence ac all;
- and ac the Sccond Term hach one Difference Or
- Rario more than the First, the Third one more
- than the Sccond, (5c. Po the LaA lave onc, hach
- one lels chan che LaH OE all; che L ast lare tWO,
- one lels than che Las Care onc, (96. S0 thac rhe
- Sum ot any Trvo oE chele equallr distane from che
- Extremes, must be equal ro che Sum ot the Fx-
- tremes; because One encreales as much 25 tHC
- Ochex decreases.
- tence ris plain,
- COROL L A R TFS.
- 0. X. 2 X. 3X. 4 X. 5X. 6X. 7X 8N. 9X. XOX
- 20 che lase Term, mulriplied by er che Number
- ot che Terms, gires 220; Thehalt ot irtiict, 11O,
- is the sum of all the Terms.
- For, By Corollary che First, 20, the Sum ot ehic
- Fixrremes, mulciplied bY 5. 5 halt the Number Ot
- Terms, produces Tr0, the Sum oE all che TerrS.
- 5. Ilence ehis very uletul Theorem may be de
- duced, Thac ehie Sum oF all che Pemns in any such
- Procression, beginnins From o, is Subduple oF the
- Sum ot (omans Terms, all equal co the srearest
- For ler che Erst Term beo, andche last x, and che
- siven Number oF che Termsn; then (by PF L. 7
- Wvill the Sum oF all che Terms oF the Progression
- be Znx, Wtich is halF Ox subduple OF n X equal re
- che Numiber oF s0 many Terms equal co e
- grearest. 8. F. D.
- sion, (i. c. aCcendine. bY the Cardinal Numbers
- continued trom Vnirs ad Infinitum, is subduple the
- Sum oF che same Number oF Terms, each oF
- Which is equalrothe oreatest; or, on che contrarr.
- this larrer Sum is double of che Former. By pre-
- Y. That che Sum oP anx Dumber os Terrris in sixing a Cxpher Detore Vrier, this vould De bur 2
- Tuch a Progresion may be trad, it the Sum of the Cale of the last Corollarr, che Sum oE the Pro-
- Extremes be multiplied by hals the Number of the
- Terms, Or halt chac Sum by che wwhole Numiber ob
- rhe Perms.
- 2. F0 gain the Sum oE nerer lo many Onanti-
- ties in rhis Progression, chere is noching neceslary tO
- fression remainine Aillthe lame.
- Buc chac ehis is erue in an infnite Series, begin-
- mins from Onier, (For in a Finite Or Decerminare
- one, the Proxorrion of the sum is alr 2ys less chan
- double; tho ic alvays approaches coit, and comes
- Po much che nearer by hou much srearer the
- be siren bur che Extremes and the Number OF Scries i5) we Mall nou chus demonstrare:
- Terms: S0 thac if by having the First Term and
- Common Fxcess, one ould sec che Last, cvould
- Stranselr disparch Ouestions in Progression.
- 3. Wilers sau Lem in Cuch a Progression may
- behad caslr, by musciplvins ehe Number oF the
- Terms, lessened by one, into the Common PXCelS.
- and then 10 thac Produet addine the ArA PerM.
- Thus it che last Term, in a Prozression ot 52
- Places vere desired, utiere che Common Diterence
- 15 3, and che Aest PerM g:
- Mulciply 5F by 3, ir produces 133; eo vhich
- addino 5 che ArA Ferm, Vou have 158 cqual 1O
- he last Perm in such a Prosression.
- 4. WVheretore iE che Progression begin wich a Cy
- Pher, (wrhich is the most Nacural and Simple Pro-
- pression; For when ic begins wich any other Perm,
- T0 che Sum oF Three TermS, 1, 2, 3, 1. c. 6,
- the Sum oF as man equal in Number co the
- Sreatelt, 1. c. 9, hasthelame Proporrion a5 3t02;
- but to the Sum OF Six TerS, 1, 2, 3, 4, 5, 6, 1. e
- 2T, the Sum of as many equal ro the grearest.
- 1. c. 36, has che Tame Proporrion 25 310 1 -] - 3
- thav 15 3 FO 2 = 2 the Decreale beins =; bue rc
- the Sum oF Tvelre Terms, wrhich mar befound
- by Coroll. L. equal 78, che Sum ot s0 mans equal
- co che greatest, viz. 244, has che lame Proportion,
- (dividing boch des by 48) 45 3 10 128, 1. c. 310
- 1 -1 = - =, (For 24 matee in and the Remain-
- der =5 is the Came 25 f) Thac i5, 25 3102 - -
- theDecrement beins no J. Since cheretore, by
- doublins che Number oF Terms. onvards, roull
- find the Decrement r0 be =5, and lo onwards in
- double Proportion; the Sum ot an Infinire Num-
- ber oF such Terms, in Arichmerical ProgresTon.
- equal to che grearest, will be tothe Sum of the
- Procression, From r ad insinitum; 25 3 202 =
- =E, (dc. Thac i6, bY Coroll. 1 and 2, 23
- 3 10 2 - =, Thac 15, 25 3EO 5 5, OF 25 2 F0 I.
- D. E. D.
- O
- 6. The Sum oF a Simple Arichmerical Progres.
- eis in realier a Compound ot rvo Proeressions; onc
- OF EqualS, 25 OF a, a, a, cn (90. aset l Oet 6
- Arichnerical ProporrionalS, 25 0. X. 2 X. 3X. 4 X.
- CSC.) chen I Cay the Sum of al the Terms will bc
- equal ro halF che Produet oF che lac Term muiri-
- Plicd by che hole Number ot ette letus. 10b)
- rhe First Corollarr, the Su OL H EC LCMIS WII
- 2. Xhe Sum oe any Duplieate Aitumeriealero.
- Ecito, Corsusca Tiom Onies ad insinitum, ls
- lubetisse ot the Sum ot as manr Ferms equat 1b
- be equal io ihe dum ol che lSCccies
- O halt ihe Dumber Ot Letirs.
- EhC ElCaccnus do 1o ehe Leclidet et ECclto. Let
- any Tuch linte Losreo IS Sreatet MMaM CHE SHD-
- eriple Proportion, bur approaches nearer and near-
- et 10 ic concimals, by hou much che laccher clie
- Serieo
Cite
Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences, fol. - . Machine transcription, not an edition: Leibniz Legible (model FoNDUE-GD_v2_ft_Leibniz, run 74). https://leibnizlegible.com/page/806933011:0659?run=74