 About 28,400 results  books.google.com Double Elements of a Projectivity on Any Form. — The problem of constructing
the double elements of a project! vity on any form can be reduced by projection or
section to the problem of constructing the double points of a projectivity on a ... 

 books.google.com 1 A projectivity <1' of a plane P on P' sets up a correspondence between the
points of a line E and those of its image E' which is called the mapping 0/ 5 on 5'
induced by <1». One and twodimensional projectivities are related by the
following ... 

 books.google.com theorem), independent of the projectivity axiom or the perspectivity theorem itself.
Hence, since the theorem of Pappus implies Desargues' theorem, it follows that
the theorem of Pappus implies that any projectivity between distinct lines can be
... 

 books.google.com Show that in a collineation (non)singular conics correspond to (non)singular
conics. What happens in a correlation? 11. Projectivity on a conic. A collineation
which preserves a nonsingular conic C establishes a onetoone
correspondence of ... 

 books.google.com Projective. and. quasiprojective. modules. Our main objective in this chapter is to
give cohomological criteria for the projectivity or quasiprojectivity of a Zp[Δ]
module X. This is done in section 2.1. In addition, in sections 2.2, 2.3, and 2.4, we
... 

 books.google.com The projectivity induced by T is not the identity, since it maps (1, 1,0) to (2,1,0).
However, it agrees with the identity on the projective points (1, 0,0) (= (2, 0, 0)), (0
, l, 0), and (0,0, 1). Thus more than three noncollinear projective points are
needed ... 

 books.google.com Reinhold Baer. Lemma 3: If 0 is a semilinear transformation of (F,A) upon (G,B),
then c_1N(S)o:N(S°) and ¢_'Q(S):=: Q(S°) for every subspace S of A. PRooF: The
following properties of the endomorphism T, of (F,A) are equivalent: /1 belongs ... 

 books.google.com This volume serves as an extension of high schoollevel studies of geometry and algebra, and proceeds to more advanced topics with an axiomatic approach. 

 books.google.com In an image of the wall the windows are related by a conjugate translation H =
THpT~', where T is the projectivity which maps the plane of the wall to the image.
The image transformation H is also an elation. The vertex of this elation is the ... 

 books.google.com y are 8isomorphic and x is projective in some sense, then y is projective in the
same sense. But we also have the following result. Theorem 13. If the strings x
and y are oisomorphic and if x is monotonically projective (Lprojective, ... 

 