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The Bohr - van Leeuwen theorem [1-6] consists in follow paradox: classicalstatistical ensambles of moving charges in external static magnetic field can'thave the induced orbital magnetic moment. I.e., the diamagnetism is notpossible. In that paper will be shown, the theorem take place only instatistical ensambles in infinite phase volume. For the statistical ensamblesin finite phase volume we have usual diamagnetic orbital moment.

The absence of Bohr - van Leeuwen paradox in classical statistical ensambles of moving charges, in finite phase volume