Caption: Figure 3: Upper half of a tractricoid (pseudosphere
The origin of [S.sub.(2)] is O = (1, 0, 0, 0, 0, 0) and this space is identified with the intersection of the pseudosphere
[[summation].sub.(2)] determined by [I.sub.(2)] with a quadratic cone P known as Plucker or Grassmann relation (invariant under the group action); these constraints are given by 
Then, by using a perturbation method, we were able to analytically calculate the shape of the buckled membrane and show that it is a pseudosphere.
Defects in nematic membranes can buckle into pseudospheres. Physical Review E, v.
In this paper we define nonnull and null pseudospherical Smarandache curves according to the Sabban frame of a spacelike curve lying on pseudosphere in Minkowski 3-space.
The pseudosphere with center at the origin and of radius r = 1 in the Minkowski 3-space [R.sup.3.sub.1] is a quadric defined by
Let [alpha] : I [subset] R [right arrow] [S.sup.2.sub.1] be a curve lying fully in pseudosphere [S.sup.2.sub.1] in [R.sup.3.sub.1].
Example 7 (the de Sitter pseudosphere is shown in Figure 6).
that is, the de Sitter pseudosphere satisfies condition (3).
Then a is congruent to an osculating curve of the second kind with tangential component g([alpha], T) = 0 if and only if [alpha] lies in a pseudosphere [S.sup.3.sub.1](r) in [E.sup.4.sub.1].
Hence a is a null helix lying in the pseudosphere. According to Theorem 4.4, [alpha] is an osculating curve of the second kind.
It is then clear that all complexified Heisenberg (k, n - k) pseudospheres