I haven't written a math post in a while. I thought might be a nice idea to write about some random mathematical ideas. Today a slightly technical one relating concave, convex properties of function to average. Actually, this comes from an engineering text book, PDEs for Scientists and Engineers by Farlow. It is a pretty nice read if you don't think existence uniqueness proofs are relevant :P So given a smooth one dimensional function f on the real line. Then we have that <center> ![00.png](https://cdn.steemitimages.com/DQmabU58YwDjys8ULPGVhoro2PR1eEkHCKXb1dSGDRwqjFf/00.png)</center> With some basic calculus this can be rewritten as <center> ![0.png](https://cdn.steemitimages.com/DQmX9z2K2VA13J74qGJoajbduAng5Da73AAKBTLWoEuYNDS/0.png) </center> So the left term inside the brackets is something like an average of f over [x-Δx,x+Δx] when considering only the endpoints. When f(x) is greater than this average then f''(x)<0 and when f(x) is smaller than this average then f''(x)>0. Or if you are too lazy to think about what this means here is a picture: <center> ![rect5477.png](https://cdn.steemitimages.com/DQmamyLahmMmUzJDV2jA77xQxowiyBSjpsx72RhjuqgWV1c/rect5477.png) </center> In the left graph f''(x)<0 the graph lies below the line so it is convex, in the right graph f''(x)>0 the graph lies above the line so it is concave. This is exactly what the earlier equation indicated so that is pretty neat. :o) --- <center> ## Merchandise :D ![2018-06-07 (2).png](https://ipfs.busy.org/ipfs/QmSutAZm2v3GyfttdAW8KfJWKLUaD4mh8jugQG47c5dnaK ) There is a [MathOwl shop](https://www.redbubble.com/people/MathOwl/shop) which sells my artsy fartsy stuff. If you got some spare money head over there. I have really cheap stuff available like these [stickers](https://www.redbubble.com/people/mathowl/shop/stickers?accordion=product&cat_context=u-stationery&ref=artist_shop_product_refinement&asc=u) They are an absolute hoot. --- --- ### Join [ #steemSTEM](/trending/steemstem) [#steemSTEM](/trending/steemstem) is a community project with the goal to promote and support Science, Technology, Engineering and Mathematics related content and activities on the STEEM blockchain. If you wish to support the [ #steemSTEM](/trending/steemstem) project you can: **Contribute STEM content using the [ #steemstem](/trending/steemstem) tag | Support steemstem authors | Join our curation trail | Join our [Discord community](https://discord.gg/mKSKQ7T) | Delegate SP to steemstem** #### Convenient Delegation Links: **[50 SP](https://steemconnect.com/sign/delegateVestingShares?delegator=&delegatee=steemstem&vesting_shares=101913.0159%20VESTS) | [100SP](https://steemconnect.com/sign/delegateVestingShares?delegator=&delegatee=steemstem&vesting_shares=203826.0318%20VESTS) | [500SP](https://steemconnect.com/sign/delegateVestingShares?delegator=&delegatee=steemstem&vesting_shares=1019130.1592%20VESTS) | [1000SP](https://steemconnect.com/sign/delegateVestingShares?delegator=&delegatee=steemstem&vesting_shares=2038258.3074%20VESTS) | [5000SP](https://steemconnect.com/sign/delegateVestingShares?delegator=&delegatee=steemstem&vesting_shares=10191291.5921%20VESTS) | [10000SP](https://steemconnect.com/sign/delegateVestingShares?delegator=&delegatee=steemstem&vesting_shares=20382581.1841%20VESTS) | [50000SP](https://steemconnect.com/sign/delegateVestingShares?delegator=&delegatee=steemstem&vesting_shares=101912901.9206%20VESTS)** ![](https://steemitimages.com/0x0/https://cdn.steemitimages.com/DQmYSEjNhZDkm4FQPsnPgBdLszb82txzj4fNtKh2Bhb5uiU/banner.png) Image courtesy: [Me ;) ](https://steemit.com/@mathowl) </center>
post_id | 71,118,341 | ||||||
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author | mathowl | ||||||
permlink | mathematics-ideas-1--1552076959 | ||||||
category | steemstem | ||||||
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created | 2019-03-08 20:29:18 | ||||||
last_update | 2019-03-08 20:48:33 | ||||||
depth | 0 | ||||||
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root_title | "Mathematics ideas #1: convex, concave functions and averages" | ||||||
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<p>Congratulations! This post has been upvoted from the communal account, @minnowsupport, by mathowl from the Minnow Support Project. It's a witness project run by aggroed, ausbitbank, teamsteem, someguy123, neoxian, followbtcnews, and netuoso. The goal is to help Steemit grow by supporting Minnows. Please find us at the <a href="https://discord.gg/HYj4yvw"> Peace, Abundance, and Liberty Network (PALnet) Discord Channel</a>. It's a completely public and open space to all members of the Steemit community who voluntarily choose to be there.</p> <p>If you would like to delegate to the Minnow Support Project you can do so by clicking on the following links: <a href="https://v2.steemconnect.com/sign/delegateVestingShares?delegator=&delegatee=minnowsupport&vesting_shares=102530.639667%20VESTS">50SP</a>, <a href="https://v2.steemconnect.com/sign/delegateVestingShares?delegator=&delegatee=minnowsupport&vesting_shares=205303.639667%20VESTS">100SP</a>, <a href="https://v2.steemconnect.com/sign/delegateVestingShares?delegator=&delegatee=minnowsupport&vesting_shares=514303.639667%20VESTS">250SP</a>, <a href="https://v2.steemconnect.com/sign/delegateVestingShares?delegator=&delegatee=minnowsupport&vesting_shares=1025303.639667%20VESTS">500SP</a>, <a href="https://v2.steemconnect.com/sign/delegateVestingShares?delegator=&delegatee=minnowsupport&vesting_shares=2053030.639667%20VESTS">1000SP</a>, <a href="https://v2.steemconnect.com/sign/delegateVestingShares?delegator=&delegatee=minnowsupport&vesting_shares=10253030.639667%20VESTS">5000SP</a>. <br><strong>Be sure to leave at least 50SP undelegated on your account.</strong></p>
post_id | 71,119,022 |
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permlink | re-mathematics-ideas-1--1552076959-20190308t210012z |
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Hey Mathowl, loving the SteemSTEM banner at the end of this post. It's lovely. thanks. I recognize those formula from my early days in college. Calculus was a tough mountain to climb at first but i got used to it and i loved it.
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it is unfortunate that a lot of undergrads die on the calculus mountain. The view from the top is quite nice :o)
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I really have respect for you mathematicians cracks! I recently helped with some homework... Just the formulas for the exponential function cost me over an hour. :-D
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https://i.redd.it/kbo23zdomfk01.jpg
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#### Hi @mathowl! Your post was upvoted by @steem-ua, new Steem dApp, using UserAuthority for algorithmic post curation! Your **UA** account score is currently 3.426 which ranks you at **#7137** across all Steem accounts. Your rank has dropped 2 places in the last three days (old rank 7135). In our last Algorithmic Curation Round, consisting of 189 contributions, your post is ranked at **#139**. ##### Evaluation of your UA score: * You're on the right track, try to gather more followers. * The readers like your work! * Try to improve on your user engagement! The more interesting interaction in the comments of your post, the better! **Feel free to join our [@steem-ua Discord server](https://discord.gg/KpBNYGz)**
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<div class='text-justify'> <div class='pull-left'> <br /> <center> <img width='85' src='https://i.postimg.cc/Bbrkt9rf/steemstem_utopian2.png'> </center> <br /> </div> <br /> <br /> This post has been voted on by the **SteemSTEM** curation team and voting trail in collaboration with **@utopian-io**. <br /><br /> If you appreciate the work we are doing then consider [voting](https://www.steemit.com/~witnesses) both projects for witness by selecting [**stem.witness**](https://steemconnect.com/sign/account_witness_vote?approve=1&witness=stem.witness) and [**utopian-io**](https://steemconnect.com/sign/account_witness_vote?approve=1&witness=utopian-io)! <br /><br /> For additional information please join us on the [**SteemSTEM discord**]( https://discord.gg/BPARaqn) and to get to know the rest of the community! <br /></div>
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