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# source(MackeyFunctorHomomorphism) -- returns the source of a Mackey functor homomorphism

- Function: source
- Usage:
    `source(F)`
- Inputs:
  - F, a Mackey Functor homomorphism,
- Outputs:
  - a C_p Mackey Functor, the source of the homomorphism F.

## Description

A homomorphism between Mackey functors has a source and a target. This method returns the source.

    i1 : source(complexLinearizationMap(5))

    o1 =        Res : | 1 5 |
           2  ----------------->   1  -┐ Conj : | 1 |
         ZZ  <-----------------  ZZ   <┘
                Tr : | 0 |
                     | 1 |

    o1 : CpMackeyFunctor

## See also

- background on Mackey functors -- a brief mathematical intro to the theory of Mackey functors
- MackeyFunctorHomomorphism -- the class of Mackey functor homomorphisms

## Ways to use this method:

- source(MackeyFunctorHomomorphism) -- returns the source of a Mackey functor homomorphism

The source of this document is in /build/macaulay2-88fgJW/macaulay2-1.25.11+ds/M2/Macaulay2/packages/CpMackeyFunctors/Documentation/HomomorphismsDoc.m2:162:0.