> Stein then asked me what other boundedness theorems I knew. I couldn't think of any concrete ones off hand, but I mumbled about a convolution operator being

> Stein then asked me what other boundedness theorems I knew. I couldn't think of any concrete ones off hand, but I mumbled about a convolution operator being bounded if its Fourier transform was bounded and had some smoothness condition, but I couldn't recall any details. You and me both, buddy!