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суть проблемы stresses
gen.	the eye of the problem; the hardpan of the question; kernel of the problem (Franka_LV); the crux of the problem (Franka_LV); heart of the problem (Franka_LV); the gist of the problem (Zukrynka); the crux of a problem; heart of the issue (sissoko); core of the matter (ssn); core issue (Tanya Gesse); the essence of the problem (Анна Ф); the roots of the problem (Анна Ф); kernel issue (Ivan Pisarev)
Игорь Миг	crux
adv.	root of the matter
dipl.	core of a problem; core of a subject
fig.of.sp.	matter of the heart (sashkomeister)
Makarov.	the nature of the problem
media.	heart of a problem (bigmaxus)
polit.	key part of the problem (ssn)
progr.	problem heart (ssn)
scient.	essence of the problem (Sergei Aprelikov)

суть проблемы: 25 phrases in 8 subjects

Business	4
Finances	1
General	8
Informal	1
Makarov	4
Programming	1
Quotes and aphorisms	1
Scientific	5