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We derive a simple formula for the weight of a LOTS using the pseudoweight. As an application we give a very short proof of the nonorderability of the Sorgenfrey-line. 1. Definitions. Let (X, T) be a Tl-space. A collection 91 E T is called a {i-base for X [3] if (i) 9t covers X, and (ii) n {uix Eu E t} = {x}, for all x E X. We put as usual 4pw(X) = mintI 1I6' is a {P-base for X}. Recall that c(X) = sup{ 1' 1q I c T and 9t is disjoint), and w(X) = min{fl, 111 c Tandl -isabaseforX).

On the weight and pseudoweight of linearly ordered topological spaces