basic mathematics已刪文
數數字：0,1,2,...
1 + 1 = 2, 2 + 1 = 3, 3 + 1 = 4,...
0 + 0 = 0, 1 + 0 = 1,...
方向：上下，左右，前後。
上下：z > 0, z < 0
左右：y < 0, y > 0
前後：x > 0, x < 0
if：
if he goes home, i will go tih him, too.
i did not go home with him, implies that he did not go home.
a => b <=> -b => -a(if and only if)
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