Question 7
The following calculations lead to the conclusion that $\pi>2019$:
(1) Let $x=\pi$ ($3.14159\ldots$), $y=3$ and $z=2019$.
(2) $-x\le -y$ and $z-y>0$.
(3) $x\ge y$ and $z>y$.
(4) Then $x\ge z$.
(5) Therefore, $\pi>2019$.
Which transition is the first that contains an error?
(1) Let $x=\pi$ ($3.14159\ldots$), $y=3$ and $z=2019$.
(2) $-x\le -y$ and $z-y>0$.
(3) $x\ge y$ and $z>y$.
(4) Then $x\ge z$.
(5) Therefore, $\pi>2019$.
Which transition is the first that contains an error?