- #1
songoku
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Homework Statement
Let a and b be real numbers
a. The condition “a + b = 0” is ...for the condition “a = 0 and b = 0”
b. The condition “a + b > 0” is ...for the condition “a > 0 and b > 0”
c. The condition ab = 0 is .... for the condition a = b = 0
d. The proposition “ a + b > 2 and ab > 1” is ....for the proposition “ a > 1 and b > 1”
e. The condition a2 – ab + b2 = 0 is ... for the condition ab = 0
We should fill the blanks with choices:
1. a necessary and sufficient condition
2. a necessary condition, but is not a sufficient condition
3. a sufficient condition, but is not a necessary condition
4. neither a necessary condition nor a sufficient condition
Homework Equations
don't know
The Attempt at a Solution
Please tell me what is the requirements for a proposition to be called necessary, or sufficient, or both, or neither
Thanks