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tokenadult commented on Algebra   feynmanlectures.caltech.e... · Posted by u/luu
tokenadult · 2 years ago
Thanks for sharing this particular Feynman lecture. The treatment here, using what are basically the Peano postulates to derive the field properties of the real numbers and then the basic structure of secondary school mathematics, follows the treatment of Landau's Grundlagen der Analysis (Foundations of Analysis), a concise book that Feynman was probably aware of as he presented his lecture. Feynman of course added a sense of excitement and wonder that makes this lecture charming to read. Such treatments of the foundations of secondary school mathematics are fairly commonplace in the better university textbooks of mathematics. I first learned of Landau's book in a discussion of mathematics education in a Usenet newsgroup back in the 1990s, and bought the German edition on the recommendation of Michael Spivak's famous textbook Calculus, which follows a similar approach (but starting from the field properties of real numbers taken as axioms). In those days, I'm pretty sure, the standard calculus textbook at Caltech, where Feynman taught, was Apostol's textbook, which starts a little bit differently but also takes a theorem-proof approach.

https://maa.org/press/maa-reviews/calculus-4

tokenadult commented on Bluesky facing degraded performance due to record high traffic   bsky.app/profile/bsky.app... · Posted by u/chandramdutta
ShadowBanThis01 · 2 years ago
TOS ≠ law
tokenadult · 2 years ago
Contractual agreements are enforceable at law. That's what makes them contracts.
tokenadult commented on Paper map sales are booming   wsj.com/articles/why-pape... · Posted by u/lxm
colanderman · 3 years ago
Google Maps doesn't even show exit numbers unless you are incredibly zoomed in. They are near useless for at-a-glance visual navigation.
tokenadult · 3 years ago
My user experience on several recent trips is that Google Maps showed me the exit number for the exit I would use next very prominently on top of the display (where it shows the direction of the next turn). Maybe that isn't rolled out consistently for all trips.
tokenadult commented on PostDrop 1/23/23 Account Verification and Open Beta   post.news/article/2KkOsCN... · Posted by u/tokenadult
tokenadult · 3 years ago
Further confirmation of the news that Post is open to all now.

https://post.news/article/2KkQM0Ou0VIvhpS0YB4RHFvANkc

tokenadult commented on So why a News Feed?   post.news/article/2KYjMzT... · Posted by u/tokenadult
staller · 3 years ago
they are doing a mobile first approach, there is no desktop version.
tokenadult · 3 years ago
Post is currently a progressive web app. There is no immediate plan to build dedicated mobile apps for Post.
tokenadult commented on So why a News Feed?   post.news/article/2KYjMzT... · Posted by u/tokenadult
mostlysimilar · 3 years ago
I can't figure out how to access the desktop version of the site, I'm stuck on the mobile. Any ideas?
tokenadult · 3 years ago
To access Post on my desktop computer, I just any browser to navigate to Post [dot] news. It's just a website. I have stored cookies on one browser I use, and I typically start up that browser with Post as one default tab. I have another browser I use for testing websites that shows me what Post looks like to users who have never logged in.

https://post.news/

u/tokenadult

KarmaCake day62538November 17, 2008
About
I am an independent educational consultant.

提要: 黑客的父亲.

tl;dr: A father of hackers.

I have no role in curating this site. I'm just one of thousands of participants like you. The Hacker News welcome message

http://ycombinator.com/newswelcome.html

gives an overview of the community experiment here, summarizing the site guidelines.

http://ycombinator.com/newsguidelines.html

The Hacker News FAQ

http://ycombinator.com/newsfaq.html

gives some additional details about how Hacker News is administered. The welcome message distills the basic rules into a simple statement: "Essentially there are two rules here: don't post or upvote crap links, and don't be rude or dumb in comment threads." To see more detailed comments about recent Hacker News moderation policies, follow the comments by HN user "dang,"

https://news.ycombinator.com/threads?id=dang

who is the lead member of the moderation team here as of 2014.

My screen name here, "tokenadult," originated on other sites, and I acknowledge that it doesn't fit well here.

http://news.ycombinator.com/item?id=1199939

http://news.ycombinator.com/item?id=2493266

The name has been controversial,

http://news.ycombinator.com/item?id=4087129

but I use it with explicit permission from the site founder (I asked him) and feel like I'm stuck with it here after using it for so many years and so many hundreds of comments.

I'm founding director and math coach for Edina Center for Academic Excellence (my "startup," actually a nonprofit organization), parent workshop director for Epsilon Camp, past president (current director) of the Minnesota Council for the Gifted and Talented (volunteer), and homeschooling father of four children (one now living independently and developing his career as a hacker in New York City's startup scene). I am very interested in research on mathematics education and education reform in general. I hope hackers come up with innovations that disrupt and improve primary, secondary, and higher education around the globe. Education policy is the issue that drew me to participate on Hacker News,

http://news.ycombinator.com/item?id=4728123

and I'm glad to see that so many participants, from the founder on to the newest member, enjoy thinking about and checking facts on education issues.

Because I have worked the last several years as a teacher of voluntary, supplemental classes in prealgebra mathematics for advanced elementary-age learners, I have had the opportunity to review mathematics textbooks in the original English and Chinese and in English translation from China, Taiwan, many publishers in the United States, India, Canada, Singapore, Japan, and Russia. I have used those materials and many articles by mathematics education researchers to prepare class materials for the classes I teach. The parents of my students have come from India, China, Russia, Korea, Vietnam, Ghana, Haiti, Australia, Pakistan, Turkey, the Philippines, Romania, Poland, Somalia, and various parts of the United States. All of the parents are aware that United States schools don't meet a "world standard" in mathematics education, and look for something better for their children. I'd like to see every child everywhere have the opportunity to have the best possible primary education.

For good information to add to Hacker News discussions, I highly recommend the online bibliographies

"Intelligence Citations,"

http://en.wikipedia.org/wiki/User:WeijiBaikeBianji/IntelligenceCitations

and "Anthropology, Human Biology, and Race Citations,"

http://en.wikipedia.org/wiki/User:WeijiBaikeBianji/AnthropologyHumanBiologyRaceCitations

which lead to many reliable sources that would do much to elevate the discussion here. Another good place to look for information is the Wikipedia article "IQ classification,"

http://en.wikipedia.org/wiki/IQ_classification

one of the few reliable articles on a related topic yet posted to Wikipedia.

I post from Minnetonka, Minnesota. I live in a neighborhood such that my family can walk or bike to the public library, most of our shopping, a nature trail, the friendly local high school, and an extensive network of regional bicycle trails. I have been to every state of the United States (and to DC and to Guam). I have lived in Taiwan (two three-year stays, one before and one after Taiwan became a free, developed country) and have traveled to Hong Kong, China, Japan, and Canada.

Education: undergraduate degree in Chinese language, with elective courses in other languages and in linguistics. J.D. magna cum laude, law review. Languages I have studied include (Modern Standard) Chinese to a proficiency level sufficient for employment as a translator and consecutive interpreter, German for reading professional materials, Japanese, Russian, other Sinitic languages, the original languages of the Bible, samplings of Latin and of various Romance languages, interesting constructed languages (conlangs), and others.

Experience: English as a second language teaching, Chinese-English interpreting, Chinese-English translation, judicial clerk for state supreme court, immigration law practice, service on various nonprofit boards, Edyth May Sliffe award for mathematics coaching.

After letting it lie fallow for more than a decade, I have begun recoding my personal website, Learn in Freedom,

http://learninfreedom.org/

to HTML5 standards as part of celebrating the site's seventeenth birthday. During 2014, the site's nineteenth year, I hope to do many content upgrades on the site, and I encourage Hacker News participants who visit Learn in Freedom to comment on my Hacker News "Ask HN: Please Critique My (Tokenadult's) Website" thread

http://news.ycombinator.com/item?id=5094480

or use the on-site comment form links, or the email links to the webmaster, or my postal address, to reach me with your thoughtful ideas on how to improve the site. Thanks for your kind--or blunt--suggestions. The suggestions I have already received are now in my to-do queue (but are crowded to low priority by work and parenting tasks). Yes, to be clear about that issue, I ("tokenadult" on HN and two other discussion sites) am the same person as Karl M. Bunday, the founder and webmaster of Learn in Freedom, and you may call me Karl in emails or in comments on Hacker News.

HIVEMIND RESPONSE NOTICE

The two biggest forms of hivemind that I encounter regularly on Hacker News are a knee-jerk reaction to decry the United States whenever world politics is discussed, and a completely credulous reaction to any claim of "mind over matter" in human medicine, no matter how poorly evidenced.

I do this at my own peril, but I try to rely on sources of information evidently not available to most Hacker News participants (or at least not regarded by many Hacker News participants) to point out that

1) the United States of America is certainly not a perfect country, but it is quite doubtful that the United States is the most harmful or blameworthy country in the world today,

and

2) "placebo medicine" has so far only been shown to have any effect at all on self-reported subjective patient symptoms such as pain and nausea that ebb and flow in the natural course of untreated disease.

If you have strong evidence that all of us can look at to check whether (for example) Russia is a greater force for good in the world than the United States, or that placebos can actually change any objectively measured physiological sign, please come forward with that evidence in your Hacker News comments. I will put up with silent downvotes any time people disagree with me, but I reserve the right to only be convinced by actual evidence from reliable sources.

METAINFORMATION

Here are some questions I've asked or comments I've made to the Hacker News community over the years about the Hacker News community itself. I'd be glad to hear your point of view on these issues.

Ask HN: How Can I Make Better Submissions to HN?

http://news.ycombinator.com/item?id=419539

Ask HN: What Kinds of Comments Should Be Upvoted?

http://news.ycombinator.com/item?id=1065084

Ask HN: How Can We Help Make HN a Better Online Community?

http://news.ycombinator.com/item?id=3174656

Ask HN: What do you like about the Hacker News community?

http://news.ycombinator.com/item?id=4399678

Ask HN: What is the consensus on Hacker News?

http://news.ycombinator.com/item?id=4489216

Ask HN: Whose Hacker News Comments Do You Follow?

http://news.ycombinator.com/item?id=4529466

Suggest HN: Submit Reliable Sources with Original Titles & Canonical URLs

http://news.ycombinator.com/item?id=4624933

A top-level comment under a thread titled, "Don’t believe everything you read"

http://news.ycombinator.com/item?id=5105664

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