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## 'Mind Your Ps and Qs' printed from http://nrich.maths.org/

Here are 16 propositions involving a real number $x$:

$x\int^x_0 ydy < 0$ |
$x> 1$ |
$0< x< 1 $ |
$x^2+4x+4 =0$ |

$x=0 $ |
$\cos(x/2)> \sin(x/2)$ |
$x> 2$ |
$x=1$ |

$2\int^{x^2}_0ydy> x^2 $ |
$x< 0 $ |
$x^2+x-2=0$ |
$x=-2 $ |

$x^3> 1$ |
$|x|> 1$ |
$x> 4$ |
$\int^x_0 \cos y dy =0$ |

[Note: the trig functions are measured in radians]

By choosing $p$ and $q$ from this list, how many correct mathematical statements of the form $p\Rightarrow q$ or $p\Leftrightarrow q$ can you make?

It is possible to rearrange the statements into four statements $p\Rightarrow q$ and four statements $p\Leftrightarrow q$. Can you work out how to do this?

NOTES AND BACKGROUND

Logical thinking is at the heart of higher mathematics: In order to construct clear, correct arguments in ever more complicated situations mathematicians rely on clarity of language and logic. Logic is also at the heart of computer programming and circuitry. To find out more, look at the ideas surrounding the

Adding
Machine problem and related set of activities.