(map,Module,Module,RingElement)

map(M,N,r) -- construct a map from a module N to M which is provided by the ring element r.

If r is nonzero, then M and N should be equal, or at least have the same number of generators.

i1 : R = ZZ/101[x]

o1 = R

o1 : PolynomialRing
i2 : map(R^2,R^3,0)

o2 = 0

             2       3
o2 : Matrix R  <--- R
i3 : map(R^2,R^2,x)

o3 = {0} | x 0 |
     {0} | 0 x |

             2       2
o3 : Matrix R  <--- R
i4 : q = map(R^2,R^2,x,Degree=>1)

o4 = {0} | x 0 |
     {0} | 0 x |

             2       2
o4 : Matrix R  <--- R
i5 : isHomogeneous q

o5 = false

See also map(Module,Module,ZZ), map, and matrix.


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