MR Collaboration Distance = 4

 
Angus Ian McLeod coauthored with Mary E. Thompson MR1331661 (96m:62091)
Mary E. Thompson coauthored with Vidyadhar P. Godambe MR0362603 (50 #15043)
Vidyadhar P. Godambe coauthored with Kaipillil Vijayan MR1439116 (98k:62007)
Kaipillil Vijayan coauthored with Paul Erdös1 MR0790938 (87b:05069)

This information was obtained from MathSciNet MR Collaboration Page:

http://www.ams.org/msnmain/cgd/index.html

For definition of Erdös number: see article at MathWorld