High Quality Content by WIKIPEDIA articles! T-theory is a branch of discrete mathematics dealing with analysis of trees and discrete metric spaces. As per Andreas Dress, T-theory originated from a question raised by Manfred Eigen, a recipient of the Nobel Prize in Chemistry, in the late seventies. He was trying to fit twenty distinct t-RNA molecules of the E. Coli bacterium into a tree. One of the most important concepts of T-theory is the tight span of a metric space. If X is a metric space, the tight span T(X) of X is, up to isomorphism, the unique minimal injective metric space that contains X. John Isbell was the first to discover the tight span in 1964, which he called the injective envelope. Dress independently constructed the same construct, which he called the tight span.

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