Hacker News Reader

Nitpick: this blog post makes an incorrect statement, namely that the domain of the inverse tangent function is -pi/2 to pi/2.

The domain of a function is the set of all possible inputs. In particular, the domain of the inverse tangent consists of all real numbers.

The author means the range.

View on HN

I wish we used different words for domain and range. Like "input range" and "output range" or something. It's an endless source of confusion, especially since range can legitimately be used for the domain if you phrase it like "the range of values we can use for the input of the inverse tangent function is -infinity to infinity."

If you like, you can call it the image.

https://gowers.wordpress.com/2011/10/13/domains-codomains-ra...

Reply on news.ycombinator.com