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We have
```
sage: A. = PowerSeriesRing(QQ)
sage: A._is_category_initialized()
False
sage: isinstance(A,Ring)
True
```
Since `Ring.__init__` initialises the category, it seems that the the base cla…
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It was agreed recently that variables would not be used for very common commands like MV, MKDIR etc.
http://groups.google.com/group/sage-devel/browse_thread/thread/bd7ae07a1157bead/970aa0dc8fa56ab…
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eg
has_many :users, :attribute => true # we store the ids on the object itself
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```
g++ -O3 -g -fPIC -pipe -I. -I../kernel -I/Applications/sage_builds/
sage-4.1.rc0/local/include -I/Applications/sage_builds/sage-4.1.rc0/
local/include -I/Applications/sage_builds/sage-4.1.rc0/…
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Try to run this code:
```
sage: sr = mq.SR(4,4,4,8, aes_mode=True, star=True, allow_zero_inversions=True)
sage: F,s = sr.polynomial_system()
```
and wait for it to terminate (~17s on my 2.33Ghz sy…
malb updated
16 years ago
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Create a ring R which is commutative, but does not inherit from CommutativeRing. That ring cannot be the base ring for an MPolynomialRing. Rather than type-checking for CommutativeRing, this shoul…
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```
sage: k = GF(next_prime(2^31)^2,'x')
sage: k['y,z']
Traceback (most recent call last):
...
OverflowError: long int too large to convert to int
sage: PolynomialRing(k,2,'x,y')
Traceback (most re…
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sage: type(PolynomialRing(ZZ, 1, 'x'))
sage: type(PolynomialRing(ZZ, 'x'))
Component: **basic arithmetic**
_Issue created by migration from https://trac.sagemath.org/ticket/764_