The plural forms are cruxes and cruces, but I've only heard the singular form in the expression "crux of the problem".
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Rajivvyas
Which is grammatically more accurate? I thought that when we refer to “crux” it usually means a main problem and hence needs to be singular.
Thanks,
This is the first time I heard “crux” use in reference to problems. I understand “core” of the problem is commonly used.