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  1. Main Page ‎(339,272 views)
  2. Create a Substepr user account ‎(47,193 views)
  3. Topics (listed alphabetically) ‎(18,860 views)
  4. Find the probability of a player being given exactly one ace in a Bridge deal ‎(18,477 views)
  5. Build an all-electric car ‎(17,901 views)
  6. Quantum field theory ‎(17,789 views)
  7. Create a new page in Substepr ‎(16,136 views)
  8. Login to an existing Substepr user account ‎(13,073 views)
  9. Use COMSOL Multiphysics to make a 2D simulation of Poiseuille flow ‎(12,656 views)
  10. Mathematics ‎(11,723 views)
  11. Find the distribution of the number of observations until the value of the first observation is exceeded. ‎(11,424 views)
  12. Contribute to an existing page in Substepr ‎(8,916 views)
  13. Integrate using 'Integration by parts' ‎(8,668 views)
  14. How to get started with Substepr ‎(8,430 views)
  15. Calculate expectation values for \(x^4\) in state \(n\) using ladder operators ‎(8,336 views)
  16. Find the probability that the larger of two iid samples exceeds the population median. ‎(7,132 views)
  17. Donor name or URL submission instructions ‎(6,946 views)
  18. Build the open source car suggested on www.theoscarproject.org ‎(6,793 views)
  19. Physics ‎(6,429 views)
  20. A few words from the founder ‎(6,259 views)
  21. Contact us ‎(6,185 views)
  22. Plan the construction of a modern-day pyramid as an open project hosted by Substepr ‎(6,159 views)
  23. Top donors ‎(5,619 views)
  24. Use the Trachtenberg speed system to multiply 715624 by 11 ‎(5,052 views)
  25. Use the Trachtenberg speed system to multiply 98834 by 11 ‎(5,044 views)
  26. Trachtenberg speed system of basic mathematics ‎(4,872 views)
  27. Create something profound ‎(4,616 views)
  28. Biology ‎(4,559 views)
  29. Show that the Holstein-Primakoff transformation satisfies the spin commutation relations ‎(4,311 views)
  30. Derive the equations of motion for a simple harmonic oscillator ‎(4,291 views)
  31. Use the Trachtenberg speed system of basic mathematics to multiply 443052 by 6 ‎(4,208 views)
  32. Use the Trachtenberg speed system to multiply 441362 by 11 ‎(4,190 views)
  33. Engineering ‎(4,173 views)
  34. Use the Trachtenberg speed system to multiply 413 by 12 ‎(3,911 views)
  35. Show that the scalar (or inner) product of position \(x\) and momentum \(p\) can be written as an exponential in terms of \(x\) and \(p\) ‎(3,906 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 ‎(3,734 views)
  37. Use the Bogoliubov transformation to diagonalise the BCS superconductivity Hamiltonian ‎(3,661 views)
  38. Quantise the coupled harmonic oscillator ‎(3,600 views)
  39. Find a fossil ‎(3,590 views)
  40. Make a humanoid robot that can sprint faster than a human ‎(3,582 views)
  41. Chemistry ‎(3,551 views)
  42. Calculate expectation values for \(x^2\) in state \(n\) using ladder operators ‎(3,504 views)
  43. Computer science ‎(3,495 views)
  44. The Top Donors list ‎(3,485 views)
  45. Build a Reprap 3-dimensional printer ‎(3,448 views)
  46. Make replica plates of a particular Petri dish ‎(3,319 views)
  47. Show that the bosonic commutation relations of the creation and annihilation operators are preserved by the Bogoliubov transformation ‎(3,266 views)
  48. Use the mean field approximation to simplify the BCS superconductivity Hamiltonian ‎(3,261 views)
  49. Use the Trachtenberg speed system to multiply 63247 by 12 ‎(3,063 views)
  50. Derive the variance of a uniform distribution. ‎(3,041 views)

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