21. The value of those wavelengths, in turn, is directly related to the value of the fine structure constant . 22. In 1999, evidence for time variability of the fine structure constant based on observation of quasars was announced. 23. In the late 1930s, the best experimental value of the fine-structure constant , ?, was approximately 1 / 136. 24. Although confirmed experimentally, the measurement is not precise enough to improve on other techniques for determining the fine-structure constant . 25. For example, no candidate theory is able to calculate the fine structure constant or the mass of the electron. 26. The eight Gell-Mann matrices ( see article for them and the structure constants ) are important for quantum chromodynamics. 27. Arthur Eddington argued that the fine structure constant was a unit fraction, first 1 / 136 then 1 / 137. 28. That is to say, the fine-structure constant shows the electron traveling at nearly 1 / 137 the speed of light. 29. In particular any nilpotent Lie algebra with irrational structure constants is an example of an unimodular group without a lattice. 30. Lava flow terminations appear as subvertical cliffs up to in height, which are structures constant with eruptions against glacial ice.
