(informal) A recommendation or suggestion.
- At 11:00, school’s out, and it’s time for rec
(informal) To recommend something such as a book, movie, product etc.
(mathematics) Relative to.
* 1994 , N[ikita] Netsvetaev, "Diffeomorphism Criteria for Simply Connected Even-Dimensional Manifolds", in, Oleg Viro, editor, Topology of Manifolds and Varieties , Advances in Soviet Mathematics [series] 18, [publisher], ISBN 0821841246, page 237,
* 1997 , Paul Selick, Introduction to Homotopy Theory , Fields Institute Monographs [series], [publisher], ISBN 0821806904, page 15,
- Since and are cobordant rel boundary and are n -connected, the number is a nonnnegative integer.
* 2002 , ,
- The following notations are in common use: (rel A'') means that ''H'' is a homotopy rel ''A'' from ''f'' to ''g ....
Algebraic Topology ], [[w:Cambridge University Press, Cambridge], ISBN 0521795400, page 355,
- Then in , there is a map such that and rel' ''A'', so the diagram above is commutative up to homotopy '''rel ''A .