"Consign them to dust and damp by way of preserving them"
with 6 comments
A mnemonic for ‘convex’ and ‘concave':
A convex function
A conCAVE function
Two mnemonics are better than one.
Written by S
Tue, 2009-03-17 at 15:56:28 +05:30
Posted in Uncategorized
Tagged with mathematics, mnemonic
Subscribe to comments with RSS.
Oh yeah? I guarantee that at least one student will remember it like this and get it exactly wrong:
concaVe (with a big V)
Convex (with a big C)
Tue, 2009-03-17 at 16:10:45 +05:30
Heh, personal mnemonics often have that problem. :)
I associate “convex” and not “concave” with the “v” sound (it’s the first letter where they’re different, so the words are really “vex” and “cave”), so it works for me. If I thought of the “big C”, I would probably reason that it the “c” can go with either word, and “concave” has a better claim on it.
I see your point, though… one should always devise one’s own mnemonics; others’ will only confuse.
Tue, 2009-03-17 at 16:16:56 +05:30
In the chapter named “Los Alamos from Below” in Surely You’re Joking…, Feynman describes what the view was like “from the bottom”, his metaphor for working as hands-on as he could, having immersed himself entirely in his work.
I read this book at the same time I had a real analysis course in college, and owing to some illogical association-by-simultaneity conflation, I came to differentiate convex and concave functions by “viewing from the bottom” (i.e. literally). Never had trouble with the definitions since.
To each his own, I guess. Mnemonics are funny constructs.
Tue, 2009-03-17 at 18:26:17 +05:30
Ah right, that would work too. These days I seldom encounter “convex” and “concave” in their natural-world meanings; it is usually in a mathematical context. So I didn’t even understand your mnemonic at first; maybe some day I’ll need a mnemonic for remembering which means ‘bulging outward / toward you’ and which means the other. :)
Wed, 2009-03-18 at 00:36:05 +05:30
[...] Convex and concave [...]
Fractal Art: Waiting for Your Love « zaytuun | Fractal & Islamic Art
Thu, 2009-03-19 at 02:32:21 +05:30
[...] convex function (need a mnemonic?) is such that for any λ in [...]
Convex, continuous, Jensen’s « The Lumber Room
Tue, 2010-06-29 at 03:46:05 +05:30
Fill in your details below or click an icon to log in:
You are commenting using your WordPress.com account. ( Log Out / Change )
You are commenting using your Twitter account. ( Log Out / Change )
You are commenting using your Facebook account. ( Log Out / Change )
You are commenting using your Google+ account. ( Log Out / Change )
Connecting to %s
Notify me of new comments via email.
Notify me of new posts via email.
Enter your email address to follow this blog and receive notifications of new posts by email.
Join 71 other followers
Create a free website or blog at WordPress.com. The Journalist v1.9 Theme.
Get every new post delivered to your Inbox.