when was slavery defined in law and custom
Slavery in international law The concept has its roots in the 1807 Abolition of Slavery Act of Great Britain. Many academics in the field perceive this as the beginning of the end of the traditional form of slavery: chattel slavery. In the 19th century, Britain controlled the majority of the world through its colonies. Consequently, in passing this law to abolish slavery, the British Parliament abolished slavery in the vast majority of its colonies.
Law of the land This term was used in 1787 to write the Supremacy Clause of the U.S. Constitution, which states: "This Constitution, and the Laws of the United States which shall be made in Pursuance thereof; and all Treaties made, or which shall be made, under the authority of the United States, shall be the supreme Law of the land...."[18] The Supremacy Clause is the only place in the Constitution where this exact term was used.
Continuous or discrete variable A continuous variable is one which can take on infinitely many, uncountable values.
Limit of a function (the Dirichlet function) has no limit at any x-coordinate.