The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » Education » math-teach

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: Re: In "square root of -1", should we say "minus 1" or "negative

Replies: 1   Last Post: Dec 5, 2012 4:49 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Robert Hansen

Posts: 11,345
From: Florida
Registered: 6/22/09
Re: In "square root of -1", should we say "minus 1" or "negative 1"?
Posted: Dec 5, 2012 4:49 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

On Dec 5, 2012, at 4:22 PM, Joe Niederberger <> wrote:

> Joe N says:
> "Martinez"
> Author of "Negative Math":
> I should point out that the track in this book investigating an alternative sign rule is not entirely original, Gerolamo Cardano did a similar investigation ~450 years ago (pg. 25):
> Joe N

That is interesting. I haven't dug deep, but that would be like replacing "i" with "-". But then what would happen to something like 3+2i? That would become 3 + (-2), but is that added like we do, or did he have a new rule of adding as well or was the unary sign symbol not related to subtraction at all?

Bob Hansen

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.