An analogy between abelian Anderson T-motives of rank $r$ and dimension $n$,
and abelian varieties over $C$ with multiplication by an imaginary quadratic
field $K$, of dimension $r$ and of signature $(n, r-n)$, permits us to get two
elementary results in the theory of abelian varieties. Firstly, we can
associate to this abelian variety a (roughly speaking) $K$-vector space of
dimension $r$ in $C^n$. Secondly, if $n=1$ then we can define the $k$-th
exterior power of these abelian varieties. Probably this analogy will be a
source of more results. For example, we discuss a possibility of finding of
analogs of abelian Anderson T-motives whose nilpotent operator $N$ is not 0.