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  1. Main Page ‎(342,693 views)
  2. Create a Substepr user account ‎(47,827 views)
  3. Topics (listed alphabetically) ‎(19,140 views)
  4. Find the probability of a player being given exactly one ace in a Bridge deal ‎(18,762 views)
  5. Build an all-electric car ‎(18,406 views)
  6. Quantum field theory ‎(18,077 views)
  7. Create a new page in Substepr ‎(16,384 views)
  8. Login to an existing Substepr user account ‎(13,113 views)
  9. Use COMSOL Multiphysics to make a 2D simulation of Poiseuille flow ‎(13,060 views)
  10. Mathematics ‎(11,754 views)
  11. Find the distribution of the number of observations until the value of the first observation is exceeded. ‎(11,605 views)
  12. Contribute to an existing page in Substepr ‎(9,050 views)
  13. Integrate using 'Integration by parts' ‎(8,965 views)
  14. How to get started with Substepr ‎(8,675 views)
  15. Calculate expectation values for \(x^4\) in state \(n\) using ladder operators ‎(8,653 views)
  16. Find the probability that the larger of two iid samples exceeds the population median. ‎(7,391 views)
  17. Donor name or URL submission instructions ‎(7,092 views)
  18. Build the open source car suggested on www.theoscarproject.org ‎(7,032 views)
  19. A few words from the founder ‎(6,473 views)
  20. Physics ‎(6,464 views)
  21. Contact us ‎(6,311 views)
  22. Plan the construction of a modern-day pyramid as an open project hosted by Substepr ‎(6,289 views)
  23. Top donors ‎(5,816 views)
  24. Use the Trachtenberg speed system to multiply 98834 by 11 ‎(5,154 views)
  25. Use the Trachtenberg speed system to multiply 715624 by 11 ‎(5,101 views)
  26. Trachtenberg speed system of basic mathematics ‎(4,906 views)
  27. Create something profound ‎(4,783 views)
  28. Biology ‎(4,610 views)
  29. Show that the Holstein-Primakoff transformation satisfies the spin commutation relations ‎(4,444 views)
  30. Derive the equations of motion for a simple harmonic oscillator ‎(4,331 views)
  31. Use the Trachtenberg speed system of basic mathematics to multiply 443052 by 6 ‎(4,311 views)
  32. Use the Trachtenberg speed system to multiply 441362 by 11 ‎(4,247 views)
  33. Engineering ‎(4,212 views)
  34. Show that the scalar (or inner) product of position \(x\) and momentum \(p\) can be written as an exponential in terms of \(x\) and \(p\) ‎(4,022 views)
  35. Use the Trachtenberg speed system to multiply 413 by 12 ‎(3,935 views)
  36. Show that if the lowering operator acts on a non-zero eigenstate of the number operator, the result is also an eigenstate of the number operator ‎(3,809 views)
  37. Find a fossil ‎(3,724 views)
  38. Use the Bogoliubov transformation to diagonalise the BCS superconductivity Hamiltonian ‎(3,714 views)
  39. Quantise the coupled harmonic oscillator ‎(3,701 views)
  40. Make a humanoid robot that can sprint faster than a human ‎(3,610 views)
  41. Chemistry ‎(3,596 views)
  42. Calculate expectation values for \(x^2\) in state \(n\) using ladder operators ‎(3,578 views)
  43. The Top Donors list ‎(3,573 views)
  44. Computer science ‎(3,522 views)
  45. Build a Reprap 3-dimensional printer ‎(3,462 views)
  46. Make replica plates of a particular Petri dish ‎(3,349 views)
  47. Use the mean field approximation to simplify the BCS superconductivity Hamiltonian ‎(3,321 views)
  48. Show that the bosonic commutation relations of the creation and annihilation operators are preserved by the Bogoliubov transformation ‎(3,306 views)
  49. Use the Trachtenberg speed system to multiply 63247 by 12 ‎(3,134 views)
  50. Derive the variance of a uniform distribution. ‎(3,098 views)

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