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Logical positivism was a popular philosophy in the mid-20th century that aimed to make philosophy more rigorous by evaluating the truth or falsehood of claims based on verifiability. It rejected claims about ethics and aesthetics as untestable and was criticized for being too simplistic and absolutist. It has influenced philosophy of science, logic, and language, but has been replaced by probabilistic approaches. The concept has been criticized for having a self-applying constraint and for misunderstanding key philosophical texts.
Logical positivism is a way of thinking that was popular in the mid-20th century and which attempted to make philosophy more rigorous by creating criteria for evaluating the truth or falsehood of certain philosophical claims. His main criterion for any claim is verifiability, which comes from two different sources: empirical claims, which come from science, and analytic truth, claims that are either true or false by definition. The concept has greatly influenced philosophy of science, logic, and the philosophy of language, among other areas, although today it is widely seen as an overly simplistic approach that has been superseded by more recent philosophies.
This philosophy is an absolutist way of looking at claims and labeling them as true, false, or meaningless. In modern times, this has been replaced by philosophies that view the truth or falsehood of claims in a probabilistic rather than an absolute light. Logical positivists themselves had many disagreements, showing that this notion was more a set of philosophies rather than a monolithic code.
A key component of logical positivism is that it rejected claims about ethics and aesthetics as untestable and therefore not part of serious philosophical thought. To have meaning, a given statement had to be linked to empirical data or analytical truths. This was a key step in connecting philosophy more closely to science, and vice versa, and it continues to have an influence to the present, playing a vital role in the formulation of philosophical ideas throughout the 20th century.
Although logical positivism was originally popular among many philosophers of the Vienna Circle – a group of philosophers instrumental in the development of analytic philosophy – it came under fire from many experts after the circle was essentially forced to disband when World War II began. Later, many philosophers criticized the approach, including Bertrand Russell, despite the fact that some of his ideas on logic did indeed influence his development. Similarly, although Ludwig Wittgenstein’s Tractatus Logico-Philosophicus influenced logical positivists, Wittgenstein himself said that their rejection of parts of the Tractatus demonstrated that they had fundamental misunderstandings about the book.
Later thinkers have distinguished between two classifications of verifiability: “strong” verification and “weak” verification, the former being something that is definitely established by experience, the latter being made probable only by experience. Many philosophers have criticized logical positivism for having a “self-applying constraint”: logical positivists claim that sentences are not testable, yet still postulate their theory with sentences. This makes their approach untenable, as they claim a theory is true, but the theory cannot apply to the sentences they use to state the theory.
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