EntityQ7341497· pop 6· linked from 15 articlesRobert AmmannSign in to saveAmerican mathematician (*1946 – †1994)ConnectionsquadrilateralEntitydigital object identifierEntitypatentEntityRoger PenroseEntityprogrammerEntityDan ShechtmanEntityQ180686EntitybibcodeEntityMartin GardnerEntitypost officeEntityBrandeis UniversityEntityHoneywell International, Inc.EntityQ22908627EntityquasicrystalEntityEindhoven University of TechnologyEntityrecreational mathematicsEntityPenrose tilingEntityMathematical ReviewsEntityPhysical Review LettersEntityBranko GrünbaumEntityCategories1946 births1994 deaths20th-century American mathematiciansAmateur mathematiciansBrandeis University alumniRecreational mathematicians