Ribarska, N.,
Tsachev, Ts.,
Krastanov, M.
(1996)
∗Partially supported by Grant MM 409/94 of the Mininstry of Education, Science and Technology,
Bulgaria.
∗∗Partially supported by Grants MM 521/95, MM 442/94 of the Mininstry of Education, Science
and Technology, Bulgaria.
The definition of the weak slope of continuous functions introduced by
Degiovanni and Marzocchi (cf. [8]) and its interrelation with the notion “steepness”
of locally Lipschitz functions are discussed. A deformation lemma and a mountain
pass theorem for...