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Correct; n is indeed a builtin thing in Sage, but it's for numerical approximation.
sage: var('n')
n
sage: E = EllipticCurve([-n^2,0]); E
Elliptic Curve defined by y^2 = x^3 + (-n^2)*x over Symbolic Ring
but there is no E.label(), as you'll find if you try it.
