An ordinary Petri net is a bipartite directed graph composedof places, drawn as circles, and transitions, drawn as bars. A formal denitionfollows [3]:Denition 2.1 An ordinary Petri Net (PN) is a 5-tuplePN = (P;T;I ;I + ;M 0) where:1. P = fp 1 ;p 2 ;:::;p n gis a nite and non-empty set of places,2.
The Colors of Geraniums. Geraniums come in a host of colors, from the traditional white, red and pink to the more exotic orange and purple. Geraniums (Pelargonium spp.) are popular garden favorites that can be cultivated throughout all the USDA hardiness zones as annuals or year-round as indoor plants.
1 Geraniums come in two varieties: true and common.. 2  True geraniums are perennials, so pruning them is a good investment. 3  Common geraniums are annuals, and they also do well with pruning, but since they won't last more than a season, it's not absolutely necessary to prune them.. Prune overwintered geraniums in the spring. The geraniums will have continued to grow over the winter, sprouting long, woody legs. It's not a very attractive look, and that's why geraniums should be pruned right at the beginning of the new growing season.