what does d stand for in arithmetic sequence
common difference
title: Look-and-say sequence text: Look-and-say sequence In mathematics, the look-and-say sequence is the sequence of integers beginning as follows: To generate a member of the sequence from the previous member, read off the digits of the previous member, counting the number of digits in groups of the same digit. For example: The look-and-say sequence was introduced and analyzed by John Conway. The idea of the look-and-say sequence is similar to that of run-length encoding. If we start with any digit "d" from 0 to 9 then "d" will remain indefinitely as the last digit of the sequence. For "d" different from 1, the sequence title: Arithmetic progression text: arithmetic progression and sometimes just called an arithmetic progression. The sum of a finite arithmetic progression is called an arithmetic series. The behavior of the arithmetic progression depends on the common difference "d". If the common difference is: The sum of the members of a finite arithmetic progression is called an arithmetic series. For example, consider the sum: This sum can be found quickly by taking the number "n" of terms being added (here 5), multiplying by the sum of the first and last number in the progression (here 2 + 14 = 16), and dividing by 2: In the title: Arithmetic progression text: Arithmetic progression In mathematics, an arithmetic progression (AP) or arithmetic sequence is a sequence of numbers such that the difference between the consecutive terms is constant. Difference here means the second minus the first. For instance, the sequence 5, 7, 9, 11, 13, 15, . . . is an arithmetic progression with "common difference" of 2. If the initial term of an arithmetic progression is formula_1 and the common difference of successive members is "d", then the "n"th term of the sequence (formula_2) is given by: and in general A finite portion of an arithmetic progression is called a finite title: Transition metal text: Transition metal In chemistry, the term transition metal (or transition element) has three possible meanings: English chemist Charles Bury (1890–1968) first used the word "transition" in this context in 1921, when he referred to a "transition series of elements" during the change of an inner layer of electrons (for example n=3 in the 4th row of the periodic table) from a stable group of 8 to one of 18, or from 18 to 32. These elements are now known as the d-block. In the "d"-block the atoms of the elements have between 1 and 10 "d" electrons. The elements of title: D major text: D major D major (or the key of D) is a major scale based on D, consisting of the pitches D, E, F, G, A, B, and C. Its key signature consists of two sharps. Its relative minor is B minor and its parallel minor is D minor. The D major scale is: \override Score.TimeSignature #'stencil = ##f \relative c' { </score> D major is well-suited to violin music because of the structure of the instrument, which is tuned G D A E. The open strings resonate sympathetically with the D string, producing a sound that is especially brilliant. This