The Adams operations are a class of cohomology operations introduced by J. F. Adams. They have a generalisation to operations on $\lambda$-rings where they are also termed power operations.
[1] | J.F. Adams, "Vectorfields on spheres" Ann. of Math. , 75 (1962) pp. 603–632 DOI 10.2307/1970213 Zbl 0112.38102 |