You can't be a 21st-century science fiction writer writing about Mars without doing tips of the hat to Edgar Rice Burroughs, to Ray Bradbury, to H.G. Wells, to the guys who first put it in the public imagination that Mars was an exciting place.
Robert J. Sawyer
Proof Based Problems Problems
The Floor Is Lava
13
2
Colourful Heptadecagon
1
0
House of Cards
2
0
Niloy's Money Machine
1
0
A Very Convex Quadrilateral
1
0
Lucky Diary
2
0
Same-e-circles
6
0
Firefighting
0
0
Ghost Quadrilateral
0
0
My Two Cents
1
1
Square Sum Sequence
0
1
Diophantine Factorial
5
0
Weird Diophantine
0
0
Too Many Balls
1
0
Unreal Real Numbers
0
1
Binary or Ternary?
0
0
Intersecting Intervals
1
1
Orthocenter Mayhem
0
0
Co-prime Sequence
1
2
The Floor Is Real
0
1