Full Idea
The B-series has two components: eternalism - the thesis that all future entities are real - and the thesis of reducibility of tense.
Gist of Idea
The B-series involves eternalism, and the reduction of tense
Source
Theodore Sider (Four Dimensionalism [2001], 4.2)
Book Reference
Sider,Theodore: 'Four Dimensionalism' [OUP 2003], p.76