Correct phrase for “Chain of equations”

In math, one often writes

a = b = c = d

to prove that a=d. How is such a sequence of equations called in English?

In German, there is “Gleichungskette”, but the direct translation “Chain of equation” is not found very often by Google, hence my query.

Solution 1:

continued equality (mathematics)

An expression in which three or more quantities are set equal by means of two or more equality signs.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Solution 2:

This is called the Transitive Property of Equality. The page uses your example (without the d).