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Index (Compilation of figured)

a compilation of figured or numbered entries for purposes of refer- In mathematics, the index of a radical is a number written over the ence. root to be extracted. An index is generally a whole number greater than 2. When the square root is indicated, the index is generally omitted, being understood.

Congregation of the Index is a congregation founded by Pius V. in 1571. It consists chiefly of cardinals, nominated by the Roman Pontiff, with other members, who are called consultors. The secretary is always a Dominican. Its duty is to examine and correct, or prohibit the reading of, books which it deems heretical, or which contain matter dangerous to faith or morals.