- Psalm 137 is the 137th psalm of the Book of Psalms, beginning in English in the King James Version: “By the rivers of Babylon, there we sat down”. The Book of Psalms is part of the third section of the Hebrew Bible, and a book of the Christian Old Testament. In the slightly different numbering system used in the Greek Septuagint and Latin Vulgate translations of the Bible, this psalm is Psalm 136. In Latin, it is known by the incipit, “Super flumina Babylonis”. The psalm is a communal lament about remembering Zion, and yearning for Jerusalem while dwelling in exile during the Babylonian captivity.
- Mathematical induction (Wikipedia)
Mathematical induction is a method for proving that a statement P(n) is true for every natural number n, that is, that the infinitely many cases P(0), P(1), P(2), P(3),… all hold. This is done by first proving a simple case, then also showing that if we assume the claim is true for a given case, then the next case is also true.