Revision history [back]

Some hints:

Look at the parent of X, and a:

sage: X.parent()
sage: a.parent()
sage: a.parent() == R

In your example, replace

sage: X = polygen(R)

by

sage: X = R.gen()

And redo everything.

Compare the documentations of both:

sage: X = polygen?
sage: R.gen?

Some hints:

Look at the parent of X, and a:

sage: X.parent()
sage: a.parent()
sage: a.parent() == R

In your example, replace

sage: X = polygen(R)

by

sage: X = R.gen()

And redo everything.

Compare the documentations of both:

sage: X = polygen?
sage: R.gen?

Some hints:

Look at the documentation of polygen:

sage: X = polygen?

Look at the parent of X, and a:X (and a):

sage: X.parent()
sage: a.parent()
sage: a.parent() == R
sage: X.base_ring()

In your example, replace

sage: X = polygen(R)

by

sage: X = R.gen()

And redo everything.

Compare the documentations of both:

ever test to understand where your previous sage: X = polygen?
sage: R.gen?
X

Ask was living and why. Do not hesitate to ask if you need more details.