What may be meant by the $\wedge$ here?

Question

I am dealing with article Two Moments suffice for Poisson Approximations: The Chen-Stein Method by Arratia, Goldstein and Gordon.

On page 11 there is an expression with a $\wedge$ appearing in it:

[...] $b_3'(1~\wedge~1.4\lambda^{-1/2})$ [...]

I do not know what this $\wedge$ means here.

Do you have an idea?

Answer 1

This symbol is used to mean "greatest lower bound", which is just the minimum of the two numbers. This page was the best reference I could find.

Answer 2

In probability, it is standard to use $x \wedge y$ for the minimum of $x$ and $y$ and $x \vee y$ for the maximum of $x$ and $y$.

See Durrett's Probability: Theory and Examples 3e's notation page (or similar) for more common probability notation.