- Star Tales - Fornax (ianridpath.com)
An obscure constellation introduced by the Frenchman Nicolas Louis de Lacaille after his trip to the Cape of Good Hope to observe the southern stars in 1751–52, depicting a chemist’s furnace used for distillation. It lies tucked into a bend in the river Eridanus.
- Associative property (Wikipedia)
In mathematics, the associative property is a property of some binary operations, which means that rearranging the parentheses in an expression will not change the result. In propositional logic, associativity is a valid rule of replacement for expressions in logical proofs.