1. A

    'simple' proof

    Is there an equilateral triangle with all its vertices in the knots of the integral square lattice? If the answer is YES, give an example, if the answer is NO, prove it.
  2. A

    'simple' proofs

    What are the last two digits of 3^1234
  3. F

    A 'simple' mechanics question

    ...well it's really hard for me.:confused: A spaceship of mass M is at rest. It separates into two parts after an explosion, in which the total kinetic energy released is E. Immediately after the explosion, the two parts have masses m1 and m2, and speeds of v1 and v2 respectively. Show that...