diff options
Diffstat (limited to 'src/algebra/polycat.spad.pamphlet')
| -rw-r--r-- | src/algebra/polycat.spad.pamphlet | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/src/algebra/polycat.spad.pamphlet b/src/algebra/polycat.spad.pamphlet index 8931a6de..499b3903 100644 --- a/src/algebra/polycat.spad.pamphlet +++ b/src/algebra/polycat.spad.pamphlet @@ -842,25 +842,25 @@ UnivariatePolynomialCategory(R:Ring): Category == if R has StepThrough then init() == init()$R::% - nextItemInner: % -> Union(%,"failed") + nextItemInner: % -> Maybe % nextItemInner(n) == - zero? n => nextItem(0$R)::R::% -- assumed not to fail + zero? n => just(nextItem(0$R)::R::%) -- assumed not to fail zero? degree n => nn:=nextItem leadingCoefficient n - nn case "failed" => "failed" - nn::R::% + nn case nothing => nothing + just(nn::R::%) n1:=reductum n n2:=nextItemInner n1 -- try stepping the reductum - n2 case % => monomial(leadingCoefficient n,degree n) + n2 + n2 case % => just(monomial(leadingCoefficient n,degree n) + n2) 1+degree n1 < degree n => -- there was a hole between lt n and n1 - monomial(leadingCoefficient n,degree n)+ - monomial(nextItem(init()$R)::R,1+degree n1) + just(monomial(leadingCoefficient n,degree n)+ + monomial(nextItem(init()$R)::R,1+degree n1)) n3:=nextItem leadingCoefficient n - n3 case "failed" => "failed" - monomial(n3,degree n) + n3 case nothing => nothing + just monomial(n3,degree n) nextItem(n) == n1:=nextItemInner n - n1 case "failed" => monomial(nextItem(init()$R)::R,1+degree(n)) + n1 case nothing => just monomial(nextItem(init()$R)::R,1+degree(n)) n1 if R has GcdDomain then |