Profile

Cover photo
Xah Lee
2,836 followers|3,175,462 views
AboutPostsCollectionsPhotosYouTube

Stream

Xah Lee

Shared publicly  - 
 
#unicode places and scenaries
🏨 🏩 πŸ₯ 🏦 🏧 πŸͺ 🏫 🏬 🏒 β›ͺ 🏣 🏀 🏠 🏑 β›« 🏯 🏰 πŸŽͺ 🎠 🎑 🎒 🏭 πŸŒƒ πŸŒ„ πŸŒ… πŸŒ† πŸŒ‡ πŸŒ‰ πŸ” πŸ– πŸ— 🏘 πŸ™ 🏚 πŸ› 🏜 🏝 🏞 πŸ• 🌊 πŸŒ‹ 🌌 πŸ—» πŸ—Ό πŸ—½ πŸ—Ύ πŸ—Ώ πŸ—Ί 🌍 🌎 🌏 🌐 http://xahlee.info/comp/unicode_place_icons.htmlο»Ώ
βˆ‘XAH. Math Β· Programing Β· Unicode β™₯ Β· Keyboard ⌨. Random Page β€’ Follow me on Twitter β€’ Follow me on g+ β€’ Math β€’ Programing β€’ Web Dev β€’ Buy Xah JavaScript Tutorial Β· Unicode. Buy xahlee.info for offline reading. Unicode: Hotel, Factory, Bank ...
1
Refurio Anachro's profile photo
 
Looking at your latest finds I once again realize how silly unicode is. There's never going to be a complete font! We don't need glyph archive dump, but a practical standard for data formats!ο»Ώ
Add a comment...

Xah Lee

Shared publicly  - 
 
beautiful characters from Unicode 7 πŸ™ πŸ™‘ πŸ™’ πŸ™“ πŸ™” πŸ™• πŸ™– πŸ™— πŸ™˜ πŸ™™ πŸ™š πŸ™› πŸ™œ πŸ™ πŸ™ž πŸ™Ÿ πŸ™  πŸ™‘ πŸ™’ πŸ™£ πŸ™€ πŸ™₯ πŸ™¦ πŸ™§ πŸ™¨ πŸ™© πŸ™ͺ πŸ™« http://xahlee.info/comp/unicode_7_new_chars.htmlο»Ώ
6
2
Kazimir Majorinc's profile photoXah Lee's profile photoPatricio Martinez's profile photoBob Mrotek's profile photo
2 comments
Xah Lee
 
hahaha. :D good eve Kaz!ο»Ώ
Add a comment...

Xah Lee

Shared publicly  - 
 
Visual Dictionary of Special Plane Curves. Now with nav panel. http://xahlee.info/SpecialPlaneCurves_dir/specialPlaneCurves.html #math #calculusο»Ώ
4
1
Nick Alcock's profile photoAmexus Carter's profile photo
Add a comment...

Xah Lee

Shared publicly  - 
 
Practical #Linux Tutorial, now with nav panel http://xahlee.info/linux/linux_index.htmlο»Ώ
10
5
Patricio Martinez's profile photoErwis Melchor's profile photoAllen Johnson's profile photoAndrii Trybynenko's profile photo
8 comments
 
+Xah Lee, there are multiple approaches, depending on which method is in use -- but for the SSH and SFTP methods, it's as simple as "if you can ssh somewhere without a password, tramp won't ask for one either". You can adjust the username used by default for connection to a particular host via something like

Host foo.bar.org
Β  Β  User wombat

in ~/.ssh/config; you can arrange to use a different private key (corresponding to a public key in ~/.ssh/authorized_keys on the server side, both generated at the same time via ssh-keygen) via the IdentityFile option; using "IdentitesOnly yes" will force that identity to be used even if you're using ssh-agent (or something else like a PKCS11Provider) Β to offer other keys by default...

... really, getting ssh to connect without a password is really not rocket science. Unfortunately it is also not widely documented, and it's very easy to come up with approaches that appear to be safe but actually provide no security at all. (e.g., if you have a network-shared $HOME filesystem with your keys in ~/.ssh, if you want those keys to provide any security at all when sshing around between the hosts sharing the filesystem you have to use AuthorizedKeysCommand or something similar in sshd_config to extract the list of authorized keys from somewhere not on that network-shared filesystem, or an attacker can just generate a brand new key on one machine, drop it in ~/.ssh/authorized_keys, and ssh everywhere in the cluster freely! Of course if you're using writable shared $HOME there are all sorts of other attacks an intruder on one system can carry out, like editing your ~/.profile...)ο»Ώ
Add a comment...

Xah Lee

Shared publicly  - 
 
twitter extempore! on formally defining the concept of β€œsystematic grammar”

0 over the past 2 decades, i had a idea about a comp lang with systematic/simple grammar.

1 Now i know how to define it formally.

2 Wolfram Language is one specific language am trying to describe, a idea of β€œsystematic” grammar.

3 on the surface, Wolfram language code is not at all β€œregular” in the normal English sense of β€œregular”

4 if you look at it, it is extremely complex, perhaps more so than perl.

5 however, it's systematic. Very regular. But, how on earth can you define this β€œregularity” or β€œsystematic” or β€œstructured” formally?

6 A language whose context free grammar spec in BNF is itself a linear/regular language.

7 if you have studied parsers, then you know what i mean.

8 else, basically it means, a language's grammar of grammar is regular!ο»Ώ
1
Add a comment...

Xah Lee

Shared publicly  - 
 
3
1
Nick Alcock's profile photoErwis Melchor's profile photo
 
Because it did in C! (before about 1978.)ο»Ώ
Add a comment...
In their circles
580 people
Have them in circles
2,836 people
Gershom B's profile photo
James Evans's profile photo
Yanko Simeonoff's profile photo
ε·¦ζ―…'s profile photo
Trending Now's profile photo
Michael Ding's profile photo
Π‘Π΅ΠΌΡ‘Π½ Ким's profile photo
Chris Worth's profile photo
Mojmír ZuzaňÑk's profile photo

Xah Lee

Shared publicly  - 
 
#Unicode da hand πŸ‘ πŸ‘Ž πŸ–’ πŸ–“ πŸ‘Œ πŸ‘Š πŸ‘‹ πŸ‘ πŸ‘ ✌ πŸ–” πŸ– πŸ– πŸ–‘ πŸ–• πŸ–– βœ‹ ☚ β˜› ☜ ☞ ☝ ☟ πŸ‘ˆ πŸ‘‰ πŸ‘† πŸ‘‡ πŸ–œ πŸ– πŸ–’ πŸ–£ πŸ–˜ πŸ–™ πŸ–ž πŸ–Ÿ πŸ–— πŸ–š πŸ–› πŸ–  πŸ–‘ http://xahlee.info/comp/unicode_hand_gesture.htmlο»Ώ
βˆ‘XAH. Math Β· Programing Β· Unicode β™₯ Β· Keyboard ⌨. Random Page β€’ Follow me on Twitter β€’ Follow me on g+ β€’ Math β€’ Programing β€’ Web Dev β€’ Buy Xah JavaScript Tutorial Β· Unicode. Buy xahlee.info for offline reading. Unicode: Hand Gesture ✌ βœ‹ β˜›. Xah Lee. , 2016-02-13 ...
1
Add a comment...

Xah Lee

Shared publicly  - 
 
few more selected clips at
http://xahmusic.org/music/Rick_and_Morty.htmlο»Ώ
1
Add a comment...

Xah Lee

Shared publicly  - 
 
 
Spinning Cardioid

A cardioid is a plane curve traced by a point on the perimeter of a circle that is rolling around a fixed circle of the same radius.
It is therefore a type of limaçon and can also be defined as an epicycloid having a single cusp. It is also a type of sinusoidal spiral, and an inverse curve of the parabola with the focus as the center of inversion.

The name cardioid, which means heart-shaped, was introduced by Giovanni Salvemini called Castiglione (or even Johann Castillon) in an article written in Latin and published in the Philosophical Transactions of the Royal Society, in 1741. However, in the study of that curve, he had been preceded already, in 1708, by Philippe de La Hire, who had determined its length.

β–Ί Animation source>>
http://flotsam.sellingwaves.com/post/127530671911/spinning-in-place-loosely-inspired-byΒ 

Further reading

β–Ί http://www-history.mcs.st-andrews.ac.uk/Curves/Cardioid.html

β–Ί http://mathworld.wolfram.com/Cardioid.html

β–Ί http://xahlee.info/SpecialPlaneCurves_dir/Cardioid_dir/cardioid.html, from +Xah LeeΒ 


#cardioid, #geometric_curves , #mathematics , #animationsο»Ώ
21 comments on original post
5
3
nasser alshammari's profile photoDavid Lane's profile photo
Add a comment...

Xah Lee

Shared publicly  - 
 
Computer Keyboard Design Flaws http://xahlee.info/kbd/keyboard_problems.htmlο»Ώ
The PC keyboard we use today, sucks big time. Let us count the ways. generic PC keyboard A Generic PC Keyboard. PC keyboard we use is derived from the design of typewriters. The design of the typewriter itself, is largely concerned about getting the machine to actually work.
2
Xah Lee's profile photoNick Alcock's profile photo
6 comments
 
A driver dead because his accelerator jammed is very slow :Pο»Ώ
Add a comment...

Xah Lee

Shared publicly  - 
 
What Desires Are Politically Important? (by Bertrand Russell)
http://wordyenglish.com/p/russell-lecture.htmlο»Ώ
I have chosen this subject for my lecture tonight because I think that most current discussions of politics and political theory take insufficient account of psychology. Economic facts, population statistics, constitutional organization, and so on, are set forth minutely.
1
1
Ivan Pierre's profile photo
Add a comment...

Xah Lee

Shared publicly  - 
 
Algorithmic Mathematical Art http://xahlee.info/math/algorithmic_math_art_3.htmlο»Ώ
M C Escher. M C Escher (1898 to 1972) is a Dutch artist whose works are predominated by mathematical themes, many of which are purely algorithmic. Although, Escher is a traditional artist; his algorithmic arts are done manually, not by a program from computer, nor with a explicit algorithmic ...
4
Nick Alcock's profile photoXah Lee's profile photo
2 comments
Xah Lee
 
+Nick Alcock snakes in in the page.ο»Ώ
Add a comment...
Xah's Collections
People
In their circles
580 people
Have them in circles
2,836 people
Gershom B's profile photo
James Evans's profile photo
Yanko Simeonoff's profile photo
ε·¦ζ―…'s profile photo
Trending Now's profile photo
Michael Ding's profile photo
Π‘Π΅ΠΌΡ‘Π½ Ким's profile photo
Chris Worth's profile photo
Mojmír ZuzaňÑk's profile photo
Collections Xah is following
Story
Tagline
thy years wants wit, thy wits wants edge and manners.
Links
YouTube