Finiteness of the number of arithmetic groups generated by reflections in Lobachevsky spaces

After results by the author (1980, 1981), and by Vinberg (1981), finiteness of the number of maximal arithmetic reflection groups in Lobachevsky spaces was not known in dimensions $2\le n\le 9$ only. Recently (2005), the finiteness was proved in dimension 2 by Long, Maclachlan and Reid, and in dimension 3 by Agol. Here we use these results in dimensions 2 and 3 to prove finiteness in all remaining dimensions $4\le n\le 9$. Methods of the author (1980, 1981) are strong enough to complete this in few lines by simple considerations.Comment: 5 pages, no figures; Var2: The Exposition polishe

Graduate Catalog, 1980-1981 & 1981-1982

https://scholar.valpo.edu/gradcatalogs/1009/thumbnail.jp

Role of Insects and Diseases in a Jack Pine Provenance Study

Two jack pine plantations were established at the Cloquet Forestry Center, Cloquet, Minnesota, in 1942 and 1943, using trees originating from 22 sites in the United States and 10 in Canada. From 1945 to 1953 the incidence of attack by insects and diseases was recorded individually for all trees, and in 1980-1981 the diameter and form of both living and dead trees were recorded. There were differences in the incidence of attack by the pests and in tree response to early injury among the various seed sources. In 1980 and in 1981 there were differences in tree form resulting from insect and both living and dead pest-free trees had the best form. The diameter increases from 1955 to 1980-1981 were almost identical for all categories with the exception of the dead pest-free trees which had the smallest diameters

Louis Lefkowitz -Evening Classes at Fordham Law School 1922-1925

Fordham Law Review xlii 1980-1981. Louis Lefkowitz graduated from Fordham Law School in 1925. He served as the Attorney General of the State of New York from 1957-1978. Here, Lefkowitz reflects on his Fordham Law experience.https://ir.lawnet.fordham.edu/alumni_biographical/1002/thumbnail.jp

Louis Lefkowitz -Evening Classes at Fordham Law School 1922-1925

Fordham Law Review xlii 1980-1981. Louis Lefkowitz graduated from Fordham Law School in 1925. He served as the Attorney General of the State of New York from 1957-1978. Here, Lefkowitz reflects on his Fordham Law experience.https://ir.lawnet.fordham.edu/alumni_biographical/1002/thumbnail.jp

1980-1981 Catalog

https://digitalcommons.sacredheart.edu/g_cat/1046/thumbnail.jp

Catalog (1980 - 1981)

A snapshot of the PCOM curriculum throughout the decades.https://digitalcommons.pcom.edu/catalogs/1000/thumbnail.jp

Geechee 1980 1981

The Geechee yearbook was not published for 1977-1980, though this volume covers portions of 1980.https://digitalcommons.georgiasouthern.edu/armstrong-geechee-yearbook/1040/thumbnail.jp