Corrigendum to "Groupoids, the Phragmen-Brouwer Property, and the Jordan   Curve Theorem", J. Homotopy and Related Structures 1 (2006) 175-183
  Omar Antol{\'\i}n Camarena pointed out a gap in the proofs in \cite{Brown15,BrownJordan} of a condition for the Phragmen--Brouwer Property not to hold; this note gives the correction in terms of a result on a pushout of groupoids, and some additional background. 
Ronald Brown and Omar Antol\'in Camarena
math.AT