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# Why do we let this?

what does the asterisk denote here ; why do we let this ? any explanation

Note by Syed Hissaan
4 months, 1 week ago

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@Calvin Lin any answer would be appreciable

- 4 months ago

It is just a change of variables. Sometimes people use $$a_1$$, sometimes people use $$a'$$, sometimes people use $$a^*$$.

We keep the $$a$$ to denote that it is relevant to the original variable $$a$$.

Staff - 4 months ago