- The Communist Manifesto (Wikipedia)
The Communist Manifesto (German: Das Kommunistische Manifest), originally the Manifesto of the Communist Party (Manifest der Kommunistischen Partei), is a political pamphlet written by Karl Marx and Friedrich Engels, commissioned by the Communist League and originally published in London in 1848. The text is the first and most systematic attempt by Marx and Engels to codify for widespread consumption the core historical materialist idea that, as stated in the text’s opening words, “the history of all hitherto existing society is the history of class struggles”, in which social classes are defined by the relationship of people to the means of production. Published against the backdrop of the Revolutions of 1848 and their subsequent repression across Europe, the Manifesto remains one of the world’s most influential political documents.
- 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.