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The constant pinging of electronic devices is driving many people to the end of their tether. Electronic devices not only overload the senses and invade leisure time. They feed on themselves: the more people tweet the more they are rewarded with followers and retweets.
1659 December 30 (date written), Robert Boyle, New Experiments Physico-Mechanicall, Touching the Spring of the Air, and Its Effects, (Made, for the Most Part, in a New Pneumatical Engine), Oxford, Oxfordshire: H Hall, printer to the University, for Tho Robinson, published 1660, →OCLC:
If you mix them, you may turn these two fluid liquors into a constant body.
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(algebra) A quantity that remains at a fixed value throughout a given discussion.
2015, Emanuel Carneiro, Damiano Foschi, Diogo Oliveira e Silva, Christoph Thiele, “A sharp trilinear inequality related to Fourier restriction on the circle”, in arXiv:
We also establish that constants are local extremizers of the Tomas-Stein adjoint restriction inequality as well as of another inequality appearing in the program..
(sciences) Any property of an experiment, determined numerically, that does not change under given circumstances.
2015, Lenny H.E. Winkel et al., “Selenium Cycling Across Soil-Plant-Atmosphere Interfaces: A Critical Review”, in Nutrients, volume 7, →DOI:
Based on their acid dissociation constants (pKa), seleneous acid (H2SeO3) and selenic acid (H2SeO4) are anionic under common environmental conditions , e.g., as selenite (SeO32−) and selenate (SeO42−).
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