In mathematics, an arithmetic progression (AP) or arithmetic sequence is a sequence of numbers such that the difference between the consecutive terms is constant. For instance, the sequence 5, 7, 9, 11, 13, 15 etc. is an arithmetic progression with common difference of 2. Wikipedia, Arithmetical Progression

Gustave Le Bon
"I must point out, by the way - and this observation will explain many historical events - that it is not only physical, but many social phenomena which can be likewise defined by curves possessing the properties we have just stated, and in which consequently, very small changes in a cause may produce very great effects. This is owing to the fact that when a cause acts for a length of time in a same direction, its effects increase in geometrical progression, while the cause varies simply in arithmetical progression. Causes are the logarithms of effects." [Gustave Le Bon, The Evolution of Matter, page 194]

See Also

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1.20 - Evolution and Devolution of Frequency
12.18 - Multiple Octave Progression
12.19 - Fibonacci Relationships
12.21 - Fibonacci Whole Numbers v Irrational Decimal near Equivalents
12.38 - Orbital revolution
14.15 - Movement Caused by Spirit
15.15 - Progressive Dissociation
15.15.05 - Progressive Association
3.04 - Power Accumulation via Fibonacci-like Patterns
8.17 - Law of Harmonic Vibrations
8.22 - Law of Harmonic Pitch
Additive and Subtractive Synthesis
arithmetic progression
arithmetical progression
Dissolution
Evolution
Fibonacci Relationships
Fibonacci Series
Fractal
Genesis of the Scale
Geometrical Progression
Golden Section
Growth
harmonic progression
Harmonic Series
Harmonic
Law of Harmonic Pitch
Law of Harmonic Vibrations
Life
Medu-Neter
Motion
Movement
musical progression
Neter
Overtone Series
Overtone
PHI
progression of adjacencies
progression of keys
Progression
Progressive Evolution
Progressive Science
Ramsay - PLATE II - The Genesis
Square Law