[Physicist]

The article is just wrong about that. 1+z = sqrt((1+beta)/(1-beta)), where beta is the velocity/c. Obviously as v goes to c, the redshift z blows up to infinity.

[2ndreconmarine]

The article is just wrong about that. 1+z = sqrt((1+beta)/(1-beta)), where beta is the velocity/c. Obviously as v goes to c, the redshift z blows up to infinity

Are you sure??? I am on travel and don't have my textbooks, but I believe you have quoted the Lorentz transformation from Special Relativity. The article makes the point that this diverges from the General Relativity Equations. I confess, I do not know the General Relativity Equations.