###### Matrix Mechanics

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*Alexei Kojevnikov*

## “Knabenphysik:” The birth of quantum mechanics from a postdoctoral viewpoint

The majority of initial contributions to quantum mechanics between 1925 and 1927, as is well known, came from younger students of physics under the age of 30. It is thus worth analyzing historically how the quantum revolution and the *More “Knabenphysik:” The birth of quantum mechanics from a postdoctoral viewpoint*

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*Anthony Duncan and Michel Janssen*

## Pascual Jordan’s Resolution of the Conundrum of the Wave-Particle Duality of Light

In 1909, Einstein derived a formula for the mean square energy fluctuations in a small subvolume of a box filled with black-body radiation. This formula is the sum of a wave term and a particle term. Einstein concluded *More Pascual Jordan’s Resolution of the Conundrum of the Wave-Particle Duality of Light*

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*Slobodan Perovic*

## Why Were Logically Distinct Theories Deemed Equivalent in Early Quantum Mechanics?

Recently, several philosophers have carefully scrutinized the key arguments pursued by physicists at the beginning of the Quantum Revolution. Based on their analysis of the physicists’ arguments, these philosophers have characterized some of *More Why Were Logically Distinct Theories Deemed Equivalent in Early Quantum Mechanics?*