My Math Forum DNE term invalidates entire equation?

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 February 22nd, 2015, 07:58 AM #1 Newbie   Joined: Mar 2013 Posts: 9 Thanks: 0 DNE term invalidates entire equation? I assume that any term that does not exist would invalidate an equation, but don't trust it as an intuition. Can I just toss the invalid terms? (=0) Last edited by skipjack; February 22nd, 2015 at 09:42 PM.
 February 22nd, 2015, 08:30 AM #2 Math Team     Joined: Jul 2011 From: Texas Posts: 3,002 Thanks: 1587 Please provide an example of an equation where a term "does not exist" so that someone may comment on your question ... Thanks from MarkFL Last edited by skipjack; February 22nd, 2015 at 09:42 PM.
 February 22nd, 2015, 09:05 AM #3 Newbie   Joined: Mar 2013 Posts: 9 Thanks: 0 For example, when a square root of a negative number is a term... super simplified... 1 + sqrt(-1) =0 (at the level of instruction before imaginary numbers are introduced.) Last edited by skipjack; February 22nd, 2015 at 09:43 PM.
 February 22nd, 2015, 09:27 AM #4 Math Team   Joined: Dec 2013 From: Colombia Posts: 7,674 Thanks: 2654 Math Focus: Mainly analysis and algebra That makes no sense with or without the square root term. But no, you can't just discard terms that you don't like. At the very least you must explain why it's a valid thing to do. Thanks from MarkFL
 February 22nd, 2015, 09:47 AM #5 Newbie   Joined: Mar 2013 Posts: 9 Thanks: 0 Oops I meant minus instead of plus, but point taken. I'm a chronic sign switcher. wip. Thanks. Last edited by skipjack; February 22nd, 2015 at 09:44 PM.
 February 22nd, 2015, 09:51 AM #6 Newbie   Joined: Mar 2013 Posts: 9 Thanks: 0 Oh, and zero instead of one... brain f**t. Last edited by skipjack; February 22nd, 2015 at 09:46 PM.
February 22nd, 2015, 10:00 AM   #7
Math Team

Joined: Jul 2011
From: Texas

Posts: 3,002
Thanks: 1587

Quote:
 Originally Posted by buckky Oops I meant minus instead of plus, but point taken. I'm a chronic sign switcher. wip. Thanks.
Quote:
 Oh, and zero instead of one... brain f**t.
huh?

Last edited by skipjack; February 22nd, 2015 at 09:45 PM.

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