# .

**Ua, Ub, Uc, Ud, Ue, Uf, Ug, Uh, Ui, Uj, Uk, Ul, Um, **

**Un, Uo, Up, Uq, Ur, Us, Ut, Uu, Uv, Uw, Ux, Uy, Uz, UNr **

Unassigned Asterids

Unassigned Caryophyllales

Unassigned Diprotodontia

Unassigned Eudicots

Unassigned (Gammaridea)

Unassigned Rosids

Uncle Petros and Goldbach's Conjecture

Undefined (mathematics)

Undergraduate Texts in Mathematics

Underwater acoustic communication

Unification and supersymmetry: the frontiers of quark-lepton physics, Rabindra Nath Mohapatra

Uniformly smooth space

Unifying theories in mathematics

Unique Factorization Theorem

Unitarity (physics)

United Kingdom Infrared Telescope (UKIRT)

United States of America Mathematical Olympiad

United States of America Mathematical Talent Search

Universal Turing machine

Universal Verification Methodology

University of Crete Observatory

University Ludwig Maximilians Observatory

University of Chicago School Mathematics Project

University of Minnesota Talented Youth Mathematics Program

University of Sydney School of Mathematics and Statistics

University of Toronto Department of Mathematics

University of Waterloo Faculty of Mathematics

Unmanned Space Missions, Britannica Educational Publishing

Unreasonable ineffectiveness of mathematics

UnsÃ¶ld, Albrecht

Unsolved problems in number theory, Richard K. Guy

Unsolved problems in plane geometry and number theory, Old and new , Victor Klee, Stan. Wagon

Unsolved problems in mathematical systems and control theory, Vincent Blondel, Alexandre Megretski

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