Aldo Commentary Essential Leopold Quotation

The Essential Aldo Leopold: Quotations and Commentaries

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Aldo Leopold - Aldo Leopold (January 11, 1887 - April 21, 1948) was a United States ecologist, forester, and environmentalist.

Land ethic - The land ethic is a perspective on environmental ethics first championed by Aldo Leopold in his book A Sand County Almanac. Leopold argues that the next step in the evolution of ethics is the expansion of ethics to include nonhuman members of the biotic community, collectively referred to as "the land.

Essential supremum and essential infimum - The concepts of essential supremum and essential infimum are related to the notions of supremum and infimum, but the former are more relevant in measure theory, where, often times one is not that interested in a property holding all the time, that is for all elements in a set, but rather almost all the time, that is, except on a set of measure zero.

Tertiary source - Where a primary source presents material from a first-hand witness to a phenomenon, and a secondary source provides commentary, analysis and criticism of primary sources, a tertiary source is a selection and compilation of primary and secondary sources. While the distinction between primary source and secondary source is essential in historiography, the distinction between these sources of evidence and tertiary sources is more peripheral.

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