"Every age has its characteristic, and our present one is not behind its predecessors in that respect; it is the age of systems, every system enforced by a treatise. The politician who opposes the corn-laws and advocates free trade, does so on a system, which, as soon as it begins to work, will set the civilized world to rights."
— 1838 (date written), L[etitia] E[lizabeth] L[andon], chapter IX, in Lady Anne Granard; or, Keeping up Appearances. […], volume I, London: Henry Colburn, […], published 1842, →OCLC, page 112:
"The bass and treble clefs combined, include all the sounds belonging to our musical system, as they appear on a 6½-octave pianoforte, extending from C C C in the bass to F in altissimo."
— [1848], J[ames] A[lexander] Hamilton, “Stave”, in A New Musical Grammar, in Three Parts: viz. Notation; Harmony and Counterpoint; Rhythm or Melody, 4th edition, London: Published only by Robert Cocks and Co. […]; sold also by Messrs. Simpkin, Marshall, and Co. […], →OCLC, part I (Notation), page 23:
"Similar studies of rats have employed four different intracranial resorbable, slow sustained release systems—surgical foam, a thermal gel depot, a microcapsule or biodegradable polymer beads."
— 2013 May–June, Charles T. Ambrose, “Alzheimer’s Disease: The Great Morbidity of the 21st Century”, in American Scientist, volume 101, number 3, archived from the original on 24 Apr 2013, page 200:
"WIPO [the World Intellectual Property Organization] reported that China had 17 of the top 20 academic organizations filing for AI-related patents. It noted China was especially strong in the fast-growing area of "deep learning." This is a machine learning method that includes speech and facial recognition systems."
— 2019 February 3, “UN Study: China, US, Japan Lead World AI Development”, in Voice of America, archived from the original on 07 Feb 2019:
"The method of solving systems of equations by matrices that we will look at is based on procedures involving equations that we are familiar with from previous mathematics courses. The main idea is to reduce a given system of equations to another simpler system that has the same solutions."
— 2017, Ken Levasseur, Al Doerr, “More Matrix Algebra”, in Applied Discrete Structures – Part 2: Algebraic Structures: Version 3.3, [Morrisville, N.C.]: Lulu.com, →ISBN, section 12.1.1 (Solutions), page 59: