Other major branches
There are many other subfields of philosophy besides its core branches. Some of the most prominent are aesthetics, philosophy of language, philosophy of mind, philosophy of religion, philosophy of science, and political philosophy.
Aesthetics in the philosophical sense is the field that studies the nature and appreciation of beauty and other aesthetic properties, like the sublime. Although it is often treated together with the philosophy of art, aesthetics is a broader category that encompasses other aspects of experience, such as natural beauty. In a more general sense, aesthetics is "critical reflection on art, culture, and nature". A key question in aesthetics is whether beauty is an objective feature of entities or a subjective aspect of experience. Aesthetic philosophers also investigate the nature of aesthetic experiences and judgments. Further topics include the essence of works of art and the processes involved in creating them.
The philosophy of language studies the nature and function of language. It examines the concepts of meaning, reference, and truth. It aims to answer questions such as how words are related to things and how language affects human thought and understanding. It is closely related to the disciplines of logic and linguistics. The philosophy of language rose to particular prominence in the early 20th century in analytic philosophy due to the works of Frege and Russell. One of its central topics is to understand how sentences get their meaning. There are two broad theoretical camps: those emphasizing the formal truth conditions of sentences and those investigating circumstances that determine when it is suitable to use a sentence, the latter of which is associated with speech act theory.
The philosophy of mind studies the nature of mental phenomena and how they are related to the physical world. It aims to understand different types of conscious and unconscious mental states, like beliefs, desires, intentions, feelings, sensations, and free will. An influential intuition in the philosophy of mind is that there is a distinction between the inner experience of objects and their existence in the external world. The mind-body problem is the problem of explaining how these two types of thing—mind and matter—are related. The main traditional responses are materialism, which assumes that matter is more fundamental; idealism, which assumes that mind is more fundamental; and dualism, which assumes that mind and matter are distinct types of entities. In contemporary philosophy, another common view is functionalism, which understands mental states in terms of the functional or causal roles they play. The mind-body problem is closely related to the hard problem of consciousness, which asks how the physical brain can produce qualitatively subjective experiences.
The philosophy of religion investigates the basic concepts, assumptions, and arguments associated with religion. It critically reflects on what religion is, how to define the divine, and whether one or more gods exist. It also includes the discussion of worldviews that reject religious doctrines. Further questions addressed by the philosophy of religion are: "How are we to interpret religious language, if not literally?"; "Is divine omniscience compatible with free will?"; and, "Are the great variety of world religions in some way compatible in spite of their apparently contradictory theological claims?" It includes topics from nearly all branches of philosophy. It differs from theology since theological debates typically take place within one religious tradition, whereas debates in the philosophy of religion transcend any particular set of theological assumptions.
The philosophy of science examines the fundamental concepts, assumptions, and problems associated with science. It reflects on what science is and how to distinguish it from pseudoscience. It investigates the methods employed by scientists, how their application can result in knowledge, and on what assumptions they are based. It also studies the purpose and implications of science. Some of its questions are "What counts as an adequate explanation?"; "Is a scientific law anything more than a description of a regularity?"; and "Can some special sciences be explained entirely in the terms of a more general science?" It is a vast field that is commonly divided into the philosophy of the natural sciences and the philosophy of the social sciences, with further subdivisions for each of the individual sciences under these headings. How these branches are related to one another is also a question in the philosophy of science. Many of its philosophical issues overlap with the fields of metaphysics or epistemology.
Political philosophy is a branch of philosophy that aims to seek knowledge on the essence of politics. It examines the basic concepts, assumptions, and arguments in the field of politics. It investigates the nature and purpose of government and compares its different forms. It further asks under what circumstances the use of political power is legitimate, rather than a form of simple violence. In this regard, it is concerned with the distribution of political power, social and material goods, and legal rights. Other topics are justice, liberty, equality, sovereignty, and nationalism. Political philosophy involves a general inquiry into normative matters and differs in this respect from political science, which aims to provide empirical descriptions of actually existing states. Political philosophy is often treated as a subfield of ethics. Influential schools of thought in political philosophy are liberalism, conservativism, socialism, and anarchism.
