Category Archives: mathematics

Malton today

Posted by Rockin' Brian on

image

With Ann.

Slide Rule

Posted by Rockin' Brian on

A useful tool I rediscovered today…

image

image

The logo for the manufacturer, British Thornton, is one I hope will appear in that iPhone app everyone seems to be playing.

image

Yes, I am of an age that knows how to use one…

image

A cardioid graph

Posted by Rockin' Brian on

For Valentine’s Day.
Google this formula…
sqrt(cos(x))cos(300x)+sqrt(abs(x))-0.7)(4-x*x)^0.01, sqrt(6-x^2), -sqrt(6-x^2) from -4.5 to 4.5
Wolfram Alpha displays it well too.

Thanks to Leo Laporte