Only if A, then
B. B→A
Must by A, in
order to B. B→A
If only A, then
B. A→B
Not A, unless B.
A→B
A, unless B.
A require B. A→B
A
depend/draw/base on B. A→B
这些是从FF笔记里摘出来的,可是在下怎么也搞不明白为啥是这样的?真是知其然不知其所以然啊啊~~
请各位NN从逻辑的角度给点指点好不?谢谢~~~~~~~~~~~~~
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