Special edge cut of type

Assume that the vertices of G are colored black and white (cf. Vol. 1-3.2.4). Let again Ri and R2 designate two special edge cuts of type 2. 

I N(S p I. Consequently, a special edge-cut of type 1 or a standard combination of edge-cuts of type 2 satisfying condition (2) of Theorem 8.6 is found. 

Case 2. G has a special edge cut R of type 1 consisting of fixed single bonds. The proof is similar... 

Damascus steel, also known in the Western world as Damascene steel, is a special type of steel that was and is still used to make sward and knifeblades. Apparently, Damascus steel was first made in India, where it was known as wootz or kuft, and later (during the second century b.c.e.) it was developed in Persia. The name "Damascus steel" was used by the Crusaders to describe the steel used by sword smiths of Damascus, Syria, famous for their ability to hammer and temper the steel into fine blades. The sword blades made from the steel had a reputation for their exceptional properties, especially their toughness, the retention of their cutting edge, as well as for a particular and characteristic decorative pattern on their surface (Figiel 1991). 

Visible lines are solid thick lines that are used for representing visible edges or contours of objects. Hidden lines are short, evenly spaced thin dashes that depict the hidden features of an object. Section lines are solid thin lines that indicate the cut surfaces of an object in a section view. Special lining symbols are sometimes used to indicate the type of material depicted. 

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