MHB Understanding the Meaning of "D_g" and "D_f" Symbols

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Hello MHB,
I am reading about a rule which I got no clue what it's name is on english but I think that you Will understand.
2d1vi2t.jpg

My question is what do they mean with that $$D_g$$ and $$D_f$$

Regards,
$$|\pi\rangle$$
 
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Re: Understanding a symbole

Petrus said:
My question is what do they mean with that $$D_g$$ and $$D_f$$

Looks like $D_g$ means the domain of g.
That is the set of all values of x for which g(x) is defined.
 
Re: Understanding a symbole

I like Serena said:
Looks like $D_g$ means the domain of g.
That is the set of all values of x for which g(x) is defined.
Thanks! That Was what I thought aswell! Thanks for taking your time!😊
Regards,
$$|\pi\rangle$$
 
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