Originally posted by BigDoggProblem Easy...see "Another Magic of Logic", started by ranjan sinha.

I would also recommend the following two puzzles in this category:
(a) The puzzled titled " Counting Problem" created by Acolyte { which was about finding a bijection ( one to one mapping) between the set I of integers and the set Q of rationals}.
(b) The " Puzzle of syntax -why only one..." created by rspoddar82, which was about filling in the blanks of a sentence with numbers written in words so as to make the two sentences correct. The second part of that puzzle is as yet unsolved. I had submitted a mathematically correct solution to the second part, but that was dubbed as wrong due to grammatical & syntactical reasons. It was stipulated that the sentence must be both mathematically and grammatically correct.

Originally posted by ranjan sinha I would also recommend the following two puzzles in this category:
(a) The puzzled titled " Counting Problem" created by Acolyte { which was about finding a bijection ( one to one mapping) between the set I of integers and the set Q of rationals}.
(b) The " Puzzle of syntax -why only one..." created by ...[text shortened]... as stipulated that the sentence must be both mathematically and grammatically correct.

"Triangle Puzzle" posted by THUD and BLUNDER was also a challenging and beautiful one.