diff options
Diffstat (limited to 'src/algebra/sum.spad.pamphlet')
| -rw-r--r-- | src/algebra/sum.spad.pamphlet | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/algebra/sum.spad.pamphlet b/src/algebra/sum.spad.pamphlet index 1aa28145..e3d66075 100644 --- a/src/algebra/sum.spad.pamphlet +++ b/src/algebra/sum.spad.pamphlet @@ -162,7 +162,7 @@ GosperSummationMethod(E, V, R, P, Q): Exports == Impl where -- sum(a(n), n) = q(n+1)/p(n) * a(n) * f(n). -- 4. Bound the degree of f(n). - (k := GosperDegBd(pn, qn, rn, n, newV)) < 0 => "failed" + negative?(k := GosperDegBd(pn, qn, rn, n, newV)) => "failed" -- 5. Find a polynomial f of degree at most k, satisfying -- p(n) = q(n+1)*f(n) - r(n)*f(n-1) @@ -275,7 +275,7 @@ GosperSummationMethod(E, V, R, P, Q): Exports == Impl where (p0 := retractIfCan(coefficient(p, 0))@Union(RN,"failed")) case "failed" => "failed" rt := -(p0::RN)/(p1::RN) - rt < 0 or denom rt ~= 1 => "failed" + negative? rt or denom rt ~= 1 => "failed" numer rt @ |