48 8 ^ov^cQ til ^h'Mimni 
de (= r,Y)f oij ef gz'): t)vi [>(ivci- DvMiuncu r,Y aforanbrct, forbi 5)uiK(ct 
£c§cfDcr fanmij ?(f|lun& fia ^'^ovijontcn; men '2((»fci)Tcu cd ue) din x ^o"C\\u 
bvc6 ti( ul (= x'), o{\ DcMiuuni cT fo» anbrcé fi( Is ■■.7'), oc\ (Siimmeu 
nf t>c (O m)i Soci'binatcr ul + li' (= ^'H" -'^0 OUyci* (x'+sz') , (col' iii-|-grin. m); 
t^i lab Oiabiud uk falDci^ ^ , d}lciaUt ui )S'mtAcn kuf fa(t)C£5 i, cl faa 9)^u){ct 
(if 55infi'Icn kus = i + m: er i ^\^U]c 9 uo-fef x'+ez'j = ^,(cor.i4- 
gfin.i); (ij3c(cDe6 cr ul + Is x'-j-fz'') = ^ » [cof (i-f iii) + efin. (i-j-iii)] 
^(cof.i + i^in-O ♦ (^^^' ^^^ + ^^"-^'0/ §♦ difiW; naav ijlcDiin for ^(cof.i 
4-£fin i) fc\»ttc£5 x'-j-^z', faacø x'-j-£z"= (-^'+^0 • (coC. 111 + gfui.iu)* - 
9?anu ce ^^ir.^ct (>:|Tfiiwcr i 55cvtica(cn e(fcr t^cm ^arnffcfcn '?Sue af et vift 
2(nfn( ©rabcr n, faa forantirc6 Summen af bets forrii"|e SoocDinatcc x 0(5 
til (x-'p?;y') , (cor. n + ;;fin.ii); men ben trebie Coorbtuat sz Uixizt uforanbref^ 
fcibi ^'(tTcauben fra SSecticalen fan ei foraubreé, faaloeugc Q^unctet bliver i SScr? 
ticalcne ^^arallcL govreflcn er *iSet?lfet i gølge 27 netop fom bet forC(]aaenbe. 
50. 
^ar Ænotenf? 9{abiu6 be Soorbinoter x, c(\ sz, ba bete^neé benne 9{a? 
biuG i Q'^U}c §♦ 27 mb x y/y -f- sz, Stcn foranbrc^j ben6 3)i?ectiDti faafcbe6, 
at tcvs i;bcr|le for^It)ttc5 bc ^lorijontale ®raber i: 6fi'oeu ben =^ vj-^ 
(x -p £z) . (cof. I g fin. 1) = X CO r. I — z fin. I -p fia. i 4- 22 cof„ 1 (»J* 2 g1, 
03 Oetcøne^ tJvb (x + ^y-j-gz) „ (cof.i + gfin.i). 
3^* . 
goranbrcé berimob^ir^ctioncn af 9tabi«6,x+'^y-|-gz v?eb at fotf!t^tfe ben^ 
Pfte ^unct be uerticale ©i'aber n: hl'wsv ben r= sz4-(x-|-?;y) » (cof. 11 -f-?; fin. n) 
r= £Z -f- xcof.ii — - yfin.ii -f- j^xfin.ii + ^/vcof.ii (§, 29),^ og Betegnet ^eb 
