how-to-prove

how-to-prove copied to clipboard

4.3.6 - Claimed Equality but Only Proved Subset

1

In this proof, you claim that ``` $ D_r \circ D_s = \{(a,b) \in R \times R \mid |a-b| < s + r\}$ ``` but you only proved that ```...

bschneidr

3.2 proving contrapositive

2

Hi Sibi, In 3.2 you mention several times that you will prove the contrapositive. Did you mean proof by contradiction instead? For example, in question 7 there is no implication....

davecan