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

**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**