l****z
发帖数: 29846 | 1 一个命题成立, 那么这个命题的逆否命题也必然成立.
我发现一个问题就是什么是这个命题的的逆否命题.
命题:
A well designed and operated control system does not indicate that there is
no material error in the report.
那么逆否命题是不是这么写?
There is material error in the report does not indicate that the control
system is not well designed and operated.
还是有其他的理解和写法? |
p**l
发帖数: 703 | |
h*********3
发帖数: 1 | 3 I think original proposition is a tautology |
h*********3
发帖数: 1 | 4 A: A well designed and operated control system.
B: there is no material error in the report.
There is no implication(aka indication) from A to B, therefore talking about
contraindication makes no sense. |
l****z
发帖数: 29846 | 5 well, just assume here A->B.
I just wonder whether the contra-position ~B->~A I wrote is correct or you
can write it differently.
about
【在 h*********3 的大作中提到】
: A: A well designed and operated control system.
: B: there is no material error in the report.
: There is no implication(aka indication) from A to B, therefore talking about
: contraindication makes no sense.
|
S*E
发帖数: 3662 | |
