Dear Sage supporters,
the following works:
sage: R=QQ['x,y']
sage: 1/R('x+y')
1/(x + y)
but the following doesn't:
sage: F=Frac(R)
sage: F('1/(x+y)')
Why?
So far, i was in the belief that F(some_string) would return a
reasonable interpretation of some_string in F, provided it exists.
Yours
Simon
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