This mathematical document discusses concepts including positive and negative integers, sets, probabilities, and occurrences within a range. It contains symbols and equations but provides no context or explanation for the mathematical content.

11. – +i
+i
!
!
}

12. 1
2
-
...
-1
1 1
1 8 2 2
2 :
p …
… # #
-1 -1
ϵ (0. ,0. )

13. I- P- P- I-
-

14. [0,1
-
occurence
(
)