diff options
Diffstat (limited to 'src/algebra/indexedp.spad.pamphlet')
| -rw-r--r-- | src/algebra/indexedp.spad.pamphlet | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/src/algebra/indexedp.spad.pamphlet b/src/algebra/indexedp.spad.pamphlet index c6ce02a1..6e131135 100644 --- a/src/algebra/indexedp.spad.pamphlet +++ b/src/algebra/indexedp.spad.pamphlet @@ -40,6 +40,8 @@ IndexedDirectProductCategory(A:BasicType,S:OrderedType): Category == ++ leadingSupport(z) returns the index of leading ++ (with respect to the ordering on the indexing set) monomial of z. ++ Error: if z has no support. + leadingTerm : % -> IndexedProductTerm(A,S) + ++ The leading term of an indexed product. reductum: % -> % ++ reductum(z) returns a new element created by removing the ++ leading coefficient/support pair from the element z. @@ -106,15 +108,12 @@ IndexedDirectProductObject(A,S): Public == Private where x = y == rep x = rep y monomial(r,s) == per [term(s,r)] map(f,x) == per [term(index tm,f coefficient tm) for tm in rep x] + leadingTerm x == + null terms x => error "Cannot take the leadingTerm of an empty product" + first terms x reductum x == per rest rep x - leadingCoefficient x == - null rep x => - error "Can't take leadingCoefficient of empty product element" - coefficient first rep x - leadingSupport x == - null rep x => - error "Can't take leadingCoefficient of empty product element" - index first rep x + leadingCoefficient x == coefficient leadingTerm x + leadingSupport x == index leadingTerm x terms x == rep x convert l == per l combineWithIf(u, v, f, p) == |