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🔖 Yet Another Introductory Number Theory Textbook (Cryptology Emphasis Version)

Bookmarked Yet Another Introductory Number Theory Textbook (Cryptology Emphasis Version) by Jonathan A. Poritz (poritz.net)

Preface This is a first draft of a free (as in speech, not as in beer) (although it is free as in beer as well) undergraduate number theory textbook. It was used for Math 319 at Colorado State University – Pueblo in the spring semester of 2014. Thanks are hereby offered to the students in that class — Megan Bissell, Tennille Candelaria, Ariana Carlyle, Michael Degraw, Daniel Fisher, Aaron Griffin, Lindsay Harder, Graham Harper, Helen Huang, Daniel Nichols, and Arika Waldrep — who offered many useful suggestions and found numerous typos. I am also grateful to the students in my Math 242 Introduction to Mathematical Programming class in that same spring semester of 2014 — Stephen Ciruli, Jamen Cox, Graham Harper, Joel Kienitz, Matthew Klamm, Christopher Martin, Corey Sullinger, James Todd, and Shelby Whalen — whose various programming projects produced code that I adapted to make some of the figures and examples in the text.

The author gratefully acknowledges the work An Introductory Course in Elementary Number Theory by Wissam Raji [see www.saylor.org/books/] from which this was initially adapted. Raji's text was released under the Creative Commons CC BY 3.0 license, see creativecommons.org/licenses/by/3.0. This work is instead released under a CC BY-SA 4.0 license, see creativecommons.org/licenses/by-sa/4.0. (The difference is that if you build future works off of this one, you must also release your derivative works with a license that allows further remixes over which you have no control.)

  • Available for download and remix, under a Creative Commons CC BY-SA 4.0 licence. First used for Math 319: Number Theory at Colorado State University-Pueblo in the spring of 2014.
  • pdf — 864K
  • source code can be found here
  • You can buy a physical copy, if that's your thing, from the on-demand printing service Lulu at this link for $6 (plus shipping and handling). [I make 61¢ profit for each such sale: I'm happy to reimburse you that amount if you will personally contact me.]
via: https://www.poritz.net/jonathan/share/index.html

Hat tip:

👓 DNA blunder creates phantom serial killer | The Independent

Read DNA blunder creates phantom serial killer (The Independent)
She was a mysterious serial killer known as the "The Woman Without a Face" and detectives across Europe spent more than 15 years doing their utmost to bring her to justice for at least six brutal murders and a string of break-ins. Yesterday, however, they were forced to admit that she probably didn't exist.
Interesting to be reading this article after just having read two articles about the DNA-related discovery of the Golden State Killer.

Henry Korn holding the very first copy of Amerikan Krazy

Had a great lunch today with Henry James Korn who’s proudly holding a copy of his latest book.

Had a great lunch today with @henryjameskorn who's proudly holding a copy of his latest book.

Instagram filter used: Normal

Photo taken at: Porta Via Italian Foods

❤️ AOC tweeted “6 weeks pregnant” = 2 weeks late on your period. Most of the men writing these bills don’t know the first thing about a woman’s body outside of the things they want from it. It’s relatively common for a woman to have a late period + not be pregnant. So this is a backdoor ban. https://t.co/xWd9GAj51b

Liked a tweet by Alexandria Ocasio-CortezAlexandria Ocasio-Cortez (Twitter)
Replied to a post by Brett KosinskiBrett Kosinski (The “B” Ark)
Taking back control of my content, I’m pulling my (modest) book reviews from Goodreads back to my blog. An underrated favourite of mine is Last Chance to See by the astounding Douglas Adams. #indieweb #books #ownyourdata

Congrats! I love the increasing number of people I’ve seen even in the last few days working on this! Are you using IndieBookClub.biz to post to your website?

I’m waiting for people to start documenting examples of owning their knitting on their websites and syndicating to/from Ravelry. #​IndieWebKnittingChallenge 

📺 "Suits" Admission of Guilt, S6 E14

Watched "Suits" Admission of Guilt, S6 E14 from USA Network, 15 February 2017
Directed by Michael Smith. With Gabriel Macht, Patrick J. Adams, Rick Hoffman, Meghan Markle. Harvey and Mike walk a fine line when they partner on a class action. Louis needs Rachel's help impressing a client during an annual presentation. And Donna and Benjamin refine their product.

👓 Butterick’s Practical Typography

Read Typewriter habits by Matthew But­t­er­ick (Butterick’s Practical Typography)

I’ve claimed through­out this book that many bad ty­pog­ra­phy habits have been im­posed upon us by the type­writer. Here, I’ve col­lected them in one list.

  1. Straight quotes rather than curly quotes (see straight and curly quotes).
  2. Two spaces rather than one space be­tween sen­tences.
  3. Mul­ti­ple hy­phens in­stead of dashes (see hy­phens and dashes).
  4. Al­pha­betic ap­prox­i­ma­tions of trade­mark and copy­right sym­bols.
  5. el­lipses made with three pe­ri­ods rather than an el­lip­sis character.
  6. Non-curly apos­tro­phes.
  7. Pre­tend­ing that ac­cented char­ac­ters don’t exist.
  8. Us­ing mul­ti­ple word spaces in a row (for in­stance, to make a first-line in­dent.)
  9. Us­ing tabs and tab stops in­stead of ta­bles.
  10. Us­ing car­riage re­turns to in­sert ver­ti­cal space.
  11. Us­ing al­pha­bet char­ac­ters as sub­sti­tutes for real math sym­bols.
  12. Mak­ing rules and bor­ders out of re­peated characters.
  13. Ig­nor­ing lig­a­tures.
  14. un­der­lin­ing anything.
  15. Be­liev­ing that mono­spaced fonts are nice to read.
  16. Abus­ing all caps.
  17. Think­ing that the best point size for body text is 12.
  18. Ig­nor­ing kern­ing.
  19. Ig­nor­ing let­terspac­ing.
  20. Too much cen­tered text.
  21. Only us­ing sin­gle or dou­ble line spac­ing.
  22. Only us­ing the line length per­mit­ted by one-inch page mar­gins.
Read Off-duty Secret Service agent shoots and kills dog on a leash in Brooklyn (nydailynews.com)
The agent, whose name has not been released, was turning the corner from E. 8th St. onto Caton Place in Windsor Terrace about 9:45 p.m. when he came across a man and his girlfriend walking with a female Belgian Shepard.

Group Photo at IndieWebCamp Austin 2017

Friends who attended IndieWebCamp Austin today.
Photo of 14 of the IndieWebCamp Austin attendees
Friends who attended IndieWebCamp Austin today.

👤 Tom Brown (); Aaron Parecki (, ); David Shanske (, ); Tantek Çelik (, ); Marty McGuire (); Manton Reece ()

I wish I could have attended IndieWebCamp Austin in person today, but had a good time attending remotely! Thanks to everyone who made the remote experience so usable.

I’m also posting this in part to take a half-stab at person tagging people using homepage webmentions after the last session on post types in which Tantek mentioned tagging specifically. I can already tell this is something I wouldn’t do often without a much more automated system. #manualuntilithurts indeed!

I’ve also found a bug in Twitter in the process! Apparently I can tag people in photos there except for Tantek, who’s username is so short, it won’t populate their pull-down menu to let me add him.