横向
1
Number greater than zero
5
Result of addition
7
Sum divided by count
8
Number less than zero
9
Mathematical statement of equality
11
Comparison of two quantities
15
Proven mathematical statement
纵向
2
Divisible by two
3
Part of a line with two endpoints
4
Repeated addition
6
Collection of distinct elements
10
Split into equal parts
12
Middle value in an ordered dataset
13
Lines that never intersect
14
The number representing nothing