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49. [4] The hydrogen atom

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48. [3] The quantum harmonic oscillator

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47. [2] Commutator relations

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46. [1] From Liouville theorem to Schrödinger equation

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43. Rainwater trapped in a linear array

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42. [2] The identity type

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39. Arranging milestones for work

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37. Valid triangle numbers

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35. [1] A picture of constructive mathematics

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10. The Kepler problem

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