A symbol is a pattern (of physical marks, electromagnetic energy, etc.) which denotes, designates, or otherwise has meaning. The notion that intelligence requires the use and manipulation of symbols, and that humans are therefore symbol systems, has been extremely in uential in arti cial intelligence. keywords: symbol, reasoning, intelligence, representation, logic This article has two parts. W...

J. Anim. Sci. Vol. 88, E-Suppl. 2/J. Dairy Sci. Vol. 93, E-Suppl. 1/Poult. Sci. Vol. 89, E-Suppl. 1 M431 Prediction of residual feed intake in beef heifers by infrared thermography. J. J. Colyn*1, A. L. Schaefer1, J. A. Basarab2, E. K. Okine3, T. Liu1, K. L. Robertson2, and S. L. Scott4, 1Agriculture and Agrifood Canada, Lacombe Research Centre, Lacombe, AB, Canada, 2Alberta Agriculture, Lacomb...

p. (x) l. 5, “Chapter 4” should read “Chapter 6”. p. 24–25: As it stands, the proof of Lemma 2.2.3 is wrong, because ψ is not necessarily surjective. However, if P is a finitely generated projective module, then the proof works. So at the beginning of the section, one should make the further observation that P = F ′(ΓΓ) is a finitely generated projective module. This is because among all projec...