Polonium initiator was classified until the 1960s. The Atomic Energy Commission and the Manhattan Project funded human experiments using polonium on five people at the University of Rochester between 1943 and 1947. The people were administered between of polonium to study its excretion. Polonium is a very rare element in nature because of the short half-life of all its isotopes. Po, Po, and Po appear in the decay chain of U; thus polonium can be found in uranium ores at about 0.1 mg per metric ton (1 part in 10), which is approximately 0.2% of the abundance of radium. The amounts
Field with one element discrete Fourier transform (complex-valued) and the related number-theoretic transform (Z/"n"Z-valued). Field with one element In mathematics, the field with one element is a suggestive name for an object that should behave similarly to a finite field with a single element, if such a field could exist. This object is denoted F, or, in a French–English pun, F. The name "field with one element" and the notation F are only suggestive, as there is no field with one element in classical abstract algebra. Instead, F refers to the idea that there should be a way to replace sets and operations, the