An electric network for generation and transmission of electric power, including a power generating part, a point of common connection for the power generating part, a transmission link, a load network, and a reactive power compensator. The glass includes SiO2 with 10 to 35 percent by mass, RO, in which R refers to an alkaline earth metal, with 20 to 60 percent by mass, B2O3 with 9 to 30 percent by mass and Al2O3 with 0 to 10 percent by mass, and which is substantially free of alkali. a third authenticator generating unit generates a third authenticator based on a second authenticator that is a second authenticator candidate contains a common part of the first authenticator. The insurance rate adjustment is communicated though a device located within a vehicle to enable perception by a vehicle occupant. The copolymer exhibits excellent mechanical properties, and capable of forming a coating film having low reflectivity.