Afterwards, Flory introduced the concept of branching points and indicated that indefinite large molecules might be formed at lower extents of reaction - . For example, a small fraction of the units might unite to form ''infinite" molecules, while the remaining units yield comparatively small molecules. Stockmayer used statistical methods to further study more complex polymerization mixtures , , which was revealed by Flory-Stockmayer theory. The gel point was calculated as follows: 1 1