雙曲螺旋麵

x

=

(sinhvcos(tauu))/(1+coshucoshv)

y

=

(sinhvsin(tauu))/(1+coshucoshv)

z

=

(coshvsinh(u))/(1+coshucoshv),

tau

E

=

(a^2[1-tau^2+(1+tau^2)cosh(2v)])/(2(1+coshucoshv)^2)

F

=

0

G

=

(a^2)/((1+coshucoshv)^2)

e

=

-(atausqrt(1-tau^2+(1+tau^2)cosh(2v))sinhusinhv)/(sqrt(2)(1+coshucoshv)^2)

f

=

(sqrt(2)atau)/((1+coshucoshv)sqrt(1-tau^2+(1+tau^2)cosh(2v)))

g

=

-(sqrt(2)atausinhusinhv)/((1+coshucoshv)sqrt(1-tau^2+(1+tau^2)cosh(2v))).