i isomorphisms

## 9000D.md

      
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              Last active
              February 9, 2018 04:52
            
              
                high-dimensional hacks
              
          
    High-dimensional Euclidean space is ℝ×ℝ×ℝ×ℝ×ℝ×…. Cartesian product of many continuous quantities.
[](http://www.jqueryscript.net/slider/Create-A-Simple-iOS-Style-Slider-with-jQuery-CSS-UI-Slider.html "You are probably most familiar with “arbitrary-dimensional spaces” as “sliders”. Interesting that in the CSS / jQuery world the way it looks takes precedence over what it does. If only I could rework the logic of every slider on the planet……mayb

  
## adzerk.r
'{"placements":[{"divName":"div1","networkId":23,"siteId":667480,"adTypes":[5]}],"user":{"key":"abc"}}' -> adzerk.json

'http://engine.adzerk.net/api/v2' -> adzerk.url


require(jsonlite)
fromJSON( adzerk.example )


require(httr)

## index.html
<html>
<head>
<script src="https://d3js.org/d3.v4.min.js"></script>

<script>
  d3.select("svg").selectAll("rect").data(["1em","5em","7em","13em"]).enter().append("rect").attr("x", (d) => { return d; })
</script>


## what.is.a.homology.theory.md

      
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              June 1, 2017 04:27
            
          
    What is "a" homology "theory"?

It’s impossible to get far in reading 20th-century mathematics without encountering the word cohomology. Cohomology & schemes are the subject of Hartshorne’s classic, where you can find out (Appendix C) that the Weil conjectures were resolved by defining a thing called l-adic cohomology.
 
Schemes are like varieties = cycles. And cohomology is a way (ok, apparently various

  
## Just do it
https://twitter.com/Amber_Coffman/status/419635162230423552

## lm.R
#  File src/library/stats/R/lm.R
#  Part of the R package, http://www.R-project.org
#
#  Copyright (C) 1995-2014 The R Core Team
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#

## calculus.md

      
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                isomorphisms
                / calculus.md
            
            
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              March 28, 2017 16:38
            
              
                calculus for programming language theorist
              
          
    Here's a silly-but-perhaps-provocative way to talk about calculus.
The only atom to start with is +1+1+1+1+1+1+1+… ↣ 5+5+5+5+5+5+5+…. Some people call
this "to quintuple" but I'll just call it ƒ. Repeated addition of the
number 5. I'm going to build up large classes of functions from this,
using "meta-moves" i.e. just operating on the function.
The first meta-move I'll allow myself is to stick the +5+5+5+5…
anywhere I want on the number line. Tangent picking. Also known as b
in y=mx+b.

  
## how.to.strikethrough
Unicode[edit]

Combining characters[edit]

In plain text scenarios where markup cannot be used, Unicode offers a number of
combining characters that achieve similar effects.

The “combining long stroke overlay” (U+0336) results in an unbroken stroke
across the text:

## peek.bash
#!/bin/bash
# peek
# look at N random lines of datafile.csv
# usage: rand datafile.csv N
# 	 rand	$1	  $2


head -1 $1					#names row of $1

## brains.R
require(ggplot2); data(msleep); attach(msleep)


animal.brains <- na.omit( data.frame( name,      round( brainwt / bodywt * 100, 1)       ))

names(list) <- c("animal", "how.brainy")
	'{"placements":[{"divName":"div1","networkId":23,"siteId":667480,"adTypes":[5]}],"user":{"key":"abc"}}' -> adzerk.json

	'http://engine.adzerk.net/api/v2' -> adzerk.url


	require(jsonlite)
	fromJSON( adzerk.example )


	require(httr)
	<html>
	<head>
	<script src="https://d3js.org/d3.v4.min.js"></script>

	<script>
	d3.select("svg").selectAll("rect").data(["1em","5em","7em","13em"]).enter().append("rect").attr("x", (d) => { return d; })
	</script>
	# File src/library/stats/R/lm.R
	# Part of the R package, http://www.R-project.org
	#
	# Copyright (C) 1995-2014 The R Core Team
	#
	# This program is free software; you can redistribute it and/or modify
	# it under the terms of the GNU General Public License as published by
	# the Free Software Foundation; either version 2 of the License, or
	# (at your option) any later version.
	#
	Unicode[edit]

	Combining characters[edit]

	In plain text scenarios where markup cannot be used, Unicode offers a number of
	combining characters that achieve similar effects.

	The “combining long stroke overlay” (U+0336) results in an unbroken stroke
	across the text:
	#!/bin/bash
	# peek
	# look at N random lines of datafile.csv
	# usage: rand datafile.csv N
	# rand $1 $2



	head -1 $1 #names row of $1
	require(ggplot2); data(msleep); attach(msleep)



	animal.brains <- na.omit( data.frame( name, round( brainwt / bodywt * 100, 1) ))

	names(list) <- c("animal", "how.brainy")