Definition Cint_span (s : seq algC) : pred algC :=
fun x => dec_Cint_span (in_tuple [seq \row_(i < 1) y | y <- s]) (\row_i x).
Fact Cint_span_key s : pred_key (Cint_span s). Proof. by []. Qed.
Canonical Cint_span_keyed s := KeyedPred (Cint_span_key s).

Lemma Cint_span_zmod_closed s : zmod_closed (Cint_span s).
Canonical Cint_span_opprPred s := OpprPred (Cint_span_zmod_closed s).