Template:Are You Sure/April 8

• ... that mathematician Donald Sarason made fundamental advances in the areas of Hardy space theory and Vanishing mean oscillation?

• ... that the Superimposed Fraunhofer (also known as a Super Fraunhofer, Fraunhofer Overlay, etc.) is a German postage stamp in which the image of Joseph von Fraunhofer demonstrating the spectroscope is superimposed on the color spectrum bar, and that this misprint is a striking example of abuse of notation in the field of Gnomonic philately?