A basis set in theoretical and computational chemistry is a set of functions (called basis functions) which are combined in linear combinations (generally as part of a quantum chemical calculation) to create molecular orbitals.
Introduction. In the spring of 1861, decades of simmering tensions between the northern and southern United States over issues including statesâ rights versus federal authority, westward expansion and slavery exploded into the American Civil War (1861-65).
April 6, 1917. The US entered World War One on April 6, 1917. This was a declaration of war by the US Senate. US declaired war against Germany on April 6, 1917 and later the same year against Austria - Hungary, December 7, 1917. The war came to an end on November 11, 1918 [armistice].