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May 30, 2018 at 19:59 comment added S. carmeli It is not true. For example multiplication by a non-constant function is $G_a$-invariant for every $a$ because it factors through the quotient by $m_a$ and the action on the quotient is trivial of course (it is just $\mathbb{C}$).
May 30, 2018 at 19:39 history asked freeRmodule CC BY-SA 4.0