In this article variation principles in modern physics are reviewed. Thes principles are used to derive equations of motions and are therefore of fundamental importance. This article focuses on the comparison between the classical variation principle used in modern physics and my approach of a new variation principle. The major difference are:

**classical variation principle for mass points **

- requires
**known boundary conditions** - requires the use of
**energy conservation** - quantization of
**energy in quantum mechanics**

**my new variation principle for mass points **

- does
**not require precisely known boundary conditions**(e.g. is valid for**continuous systems**). **requires only particle number conservation**(e.g. annihilation of particles such as e- and e+ annihilation is forbidden)- does
**not require the principle of energy conservation**(!!!) - does
**not require the quantization of energy**in quantum mechanics

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Variationsprinzipien (DE)**