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@eric_g Yikes, should I report it somewhere?

In Sage 7.5.1 I'm trying to work with unknown values in GF(3) and polynomials.

The following code gives me a segmentation fault:

P.<x> = GF(3)['x']
var('a')
sigma = 2*x+ 1
print(a*(sigma))

What is the proper way to handle unknown GF(3) values like "a" in Sage?

I'm trying to do symbolic calculation with polynomials on GF(3), multiplying unknown values in GF(3) by polinomials. The following code fails with a segmentation fault (Sage version is 7.5.1):

P.<x> = GF(3)['x']
var('a')
sigma = 2*x^5 + x^3 + x^2 + 1
print(a*sigma)

What went wrong? How should I work with unknown values like 'a' in finite fields?