diff options
Diffstat (limited to 'src/algebra/derham.spad.pamphlet')
| -rw-r--r-- | src/algebra/derham.spad.pamphlet | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/algebra/derham.spad.pamphlet b/src/algebra/derham.spad.pamphlet index fe2a2e36..6e526e21 100644 --- a/src/algebra/derham.spad.pamphlet +++ b/src/algebra/derham.spad.pamphlet @@ -87,7 +87,8 @@ ExtAlgBasis(): Export == Implement where coerce(li:(L I)) == for x in li repeat - if x ~= 1 and x ~= 0 then error "coerce: values can only be 0 and 1" + if not one? x and not zero? x then + error "coerce: values can only be 0 and 1" li degree x == (_+/x)::NNI |