Comments on Non-invertible Symmetries in Argyres-Douglas Theories

We demonstrate the presence of non-invertible symmetries in an infinite family of superconformal Argyres-Douglas theories. This class of theories arises from diagonal gauging of the flavor symmetry of a collection of multiple copies of D-p(SU( N)) theories. The same set of theories that we study can also be realized from 6d N = (1, 0) compactification on a torus. The main example in this class is the ( A(2), D-4) theory. We show in detail that this specific theory bears the same structures of non-invertible duality and triality defects as those of N = 4 super Yang-Mills with gauge algebra su(2). We extend this result to infinitely many other Argyres-Douglas theories in the same family, including those with central charges a = c whose conformal manifold is one dimensional, and those with a not equal c whose conformal manifold has dimension larger than one. Our result is supported by examining certain special cases that can be realized in terms of theories of class S.