A certain quantity called the "index" traditionally used to classify solutions was infinite, and therefore unhelpful, in many important but apparently intractable problems.
Ang isang tiyak na dami ng tinatawag na "index" tradisyonal na ginamit sa pag-uri-uriin solusyon ay walang hanggan, at dahil dito, unhelpful, sa maraming mahalagang ngunit apparently mailap problema.