Some Geotechnical Characteristics of the Subway Construction in Sofia City, Bulgaria

Abstract

The edge Folkman numbers are defined by the equality Fe(a1, . . . , ar; q) = min{|V (G)| : G e → (a1, . . . , ar; q) and cl(G) < q}. a2) where C5 is the simple cycle on 5 vertices. We prove some upper bounds on edge Folkman numbers for which R(a1, a2) < R(a1 − 1, a2) + R(a1, a2 − 1) and we cite some lower bounds. Faculty of mathematics and informaticsReceived xx.xx.199x