The word "logicism" is spelling with the IPA phonetic transcription of /lɒdʒɪsɪzəm/. The first syllable is pronounced with the "o" sound as in "lot," and the second syllable has the "i" as in "sit" sound. The final "ism" is pronounced with the "izm" sound as in "prism." "Logicism" refers to a philosophical term that advocates for the use of logic in mathematics. It was first used by philosopher Bertrand Russell in the early 20th century.
Logicism is a philosophical and mathematical movement that asserts that all mathematical principles and concepts can be reduced to or explained in terms of logic. It posits that mathematics is, at its core, a branch of logic that can be developed and understood through the study of formal logic systems. Logicism seeks to establish that mathematical propositions are fundamentally logical truths, and that mathematical reasoning can be entirely reconstructed in terms of logical reasoning.
The logicist position was famously developed and advocated by the influential philosopher and mathematician Gottlob Frege, who aimed to show that arithmetic can be derived from logic alone. It gained further momentum with the works of Bertrand Russell and Alfred North Whitehead in their monumental Principia Mathematica.
According to logicism, mathematical statements can be deduced from a set of logical principles and definitions, such as the laws of identity, non-contradiction, and excluded middle. This implies that mathematical knowledge is inherently logical knowledge, and that the study of mathematics is, ultimately, the study of logic. Logicism seeks to unify mathematics and logic, suggesting that the former can be reduced to the latter without the need for any additional postulates or axioms.
While logicism has been highly influential and has significantly influenced the development of mathematical logic, its claims have faced criticism and alternative positions have emerged. The most prominent challenge to logicism came from the intuitionist school, led by mathematicians such as L.E.J. Brouwer, who argued that mathematics is fundamentally derived from human intuition. Despite the criticisms, logicism continues to be an important and ongoing debate in the philosophy and foundations of mathematics.
The word "logicism" is derived from the noun "logic" combined with the suffix "-ism", which is used to form nouns indicating a system, principle, or ideological belief. "Logic" itself comes from the Ancient Greek word "logikḗ", meaning "the science or art of reasoning". The suffix "-ism" denotes a belief system, philosophy, or practice related to the root word. Therefore, "logicism" refers to the doctrine or philosophy that emphasizes the role of logic in thought, knowledge, or reasoning. Specifically, it is often associated with the logical foundations of mathematics, as in the philosophy of logicism developed by Gottlob Frege and Bertrand Russell in the late 19th and early 20th centuries.