「まじ」as "will not"


In Shiina Ringo's song 「長く短い祭」 (Nagaku Mijikai Matsuri), she sing the
following line :

> 忘るまじ、我らの夏を

I already knew the word 「まじ」 as in "seriously", but I found two different
translations of the sentence on the internet, more or less professional, that
translate it as :

> Our summer won't be forgotten

and

> We're seriously losing our summer

I did not know that it could be used as "will not" or "must not" and would
like to know if it was the right translation in this context.

Here is the link for the song : <https://youtu.be/n9J4XGey-z8>




Auxiliary まじ stands for either negative conjecture ("must not") or negative
volition ("will not"). So, 忘るまじ、我らの夏を means either "we won't forget our
summer" or "we mustn't forget our summer", but never "we're seriously losing
our summer".




Auxiliary まじ stands for either negative conjecture ("must not") or negative
volition ("will not"). So, 忘るまじ、我らの夏を means either "we won't forget our
summer" or "we mustn't forget our summer", but never "we're seriously losing
our summer".

