Physical world and mathematics

Feldspar

Feldspar is a group of rock-forming aluminosilicate minerals containing potassium, sodium, or calcium; it makes up about 60 percent of the Earth's crust and is used mainly in glassmaking and ceramics.

Feliciano Giustino

Feliciano Giustino is a computational condensed matter physicist, professor of physics at the University of Texas at Austin, known for electron–phonon theory and the open-source EPW code.

Felipe Cucker

Felipe Cucker, also known as Juan Felipe Cucker Farkas, is a Spanish mathematician at City University of Hong Kong who co-founded the Society for the Foundations of Computational Mathematics.

Feliu Maseras

Feliu Maseras is a Spanish computational chemist who has led a research group at the Institute of Chemical Research of Catalonia since 2004, studying catalytic reaction mechanisms.

Oct 15, 2026

FELIX (free-electron laser)

FELIX, the Free Electron Laser for Infrared eXperiments, is a Dutch user facility in Nijmegen producing intense, widely tunable infrared and far-infrared radiation for research in physics, chemistry, and biology.

Felix Andries Vening Meinesz

Felix Andries Vening Meinesz (1887–1966) was a Dutch geophysicist and geodesist who measured gravity at sea from submarines and discovered belts of negative gravity anomalies along the Indonesian deep-sea trenches.

Felix Behrend

Felix Adalbert Behrend was a German-born mathematician at the University of Melbourne known for his 1946 construction of large sets of integers with no three-term arithmetic progression.

Felix Bernstein (German mathematician)

Felix Bernstein (1878–1956) was a German mathematician and statistician who proved the Schröder–Bernstein theorem as a teenager and showed in 1924 that ABO blood groups inherit as three alleles.

Felix Bloch

Felix Bloch (1905–1983) was a Swiss-born American physicist at Stanford University who shared the 1952 Nobel Prize in Physics for the discovery of nuclear magnetic resonance in bulk matter.

Felix Boehm

Felix Boehm (1924–2021) was a Swiss-born experimental nuclear and particle physicist who spent his career at Caltech and was elected to the National Academy of Sciences in 1983.

Felix Browder

Felix Earl Browder (1927–2016) was an American mathematician who pioneered nonlinear functional analysis and monotone operator theory, taught at Chicago and Rutgers, and received the 1999 National Medal of Science.

Felix Creutzig

Felix Creutzig, born 1979 in Hannover, is a German climate mitigation scientist who heads groups at MCC Berlin and the Potsdam Institute, and holds a TU Berlin chair.

Felix Deschler

Felix Deschler (Félix Deschler) is a physical chemist studying ultrafast spectroscopy of hybrid perovskites, known for photon recycling in perovskite solar cells and Full Professor at Heidelberg University since 2022.

Felix Ehrenhaft

Felix Ehrenhaft (1879–1952) was an Austrian experimental physicist at the University of Vienna known for discovering photophoresis in 1918 and for his long dispute with Robert Millikan over indivisible electric charge.

Félix Freire

Félix Freire, born in Marín in 1977, is a Spanish organic chemist known for work on stimuli-responsive helical polymers, a Full Professor at the University of Vigo since 2024.

Felix Hausdorff

Felix Hausdorff, who also wrote philosophy and literature as Paul Mongré, was a German mathematician who founded set-theoretic topology with his 1914 Grundzüge der Mengenlehre.

Felix Klein

Felix Klein, born Christian Felix Klein (1849–1925), was a German mathematician, professor at Göttingen from 1886, whose 1872 Erlanger Programm unified geometries through group invariants and shaped modern mathematics.

Felix N. Castellano

Felix N. Castellano, also known as Felix Castellano, is an American photochemist who studies photochemical upconversion and solar fuels as a chemistry professor at North Carolina State University.

Felix Paul Kapron

Felix Paul Kapron is a physicist at Corning Glass Works, first author of the 1970 paper reporting the first optical fiber with loss below 20 dB/km.

Felix Pirani

Felix Pirani was a British mathematical physicist who helped establish that gravitational waves are a real, observable prediction of general relativity while working at King's College London.

Felix R. Fischer

Felix R. Fischer (born 1980) is a German-trained American-based organic chemist and professor at UC Berkeley known for building graphene nanoribbons atom by atom through organic synthesis.

Félix Tisserand

Félix Tisserand (1845–1896) was a French astronomer and celestial mechanician, director of the Paris Observatory, author of the Traité de mécanique céleste, and origin of the Tisserand parameter.

Fèlix Urpí

Fèlix Urpí (Fèlix Urpí Tubella) is a Spanish organic chemist, Professor of Organic Chemistry at the Universitat de Barcelona, known for titanium enolate methods and stereoselective synthesis.

Felix Villars

Felix Villars (1921–2002) was a Swiss-born American theoretical physicist, on the MIT faculty for 41 years, best known for Pauli–Villars regularization with Wolfgang Pauli and for founding biological physics at MIT.

Felix von Oppen

Felix von Oppen (born 1966 in Berlin) is a German theoretical physicist, professor at Freie Universität Berlin, known for Majorana bound states in quantum wires and helical Shiba chains.

Felix Weinberg

Felix Jiri Weinberg (1928–2012) was a British combustion physicist who spent his career at Imperial College London, pioneering optical flame diagnostics, electric-field combustion control, and the heat-recirculating burner.

Félix Zamora

Félix Zamora is a Spanish materials chemist at the Universidad Autónoma de Madrid who studies covalent organic frameworks, 2D materials, and coordination polymers, and won the Spanish Royal Society of Chemistry's Research Excellence Award in 2015.

Felkin–Anh model

The Felkin–Anh model predicts which face of a carbonyl a nucleophile attacks when the adjacent carbon is a stereocenter, refining Cram's rule in 1968; it places the α-carbon's largest substituent perpendicular to the carbonyl bond.