arvearve

Mathematics: What do grad students in math do all day?

by Yasha Berchenko-Kogan

A lot of math grad school is reading books and papers and trying to understand what's going on. The difficulty is that reading math is not like reading a mystery thriller, and it's not even like reading a history book or a New York Times article.

The main issue is that, by the time you get to the frontiers of math, the words to describe the concepts don't really exist yet. Communicating these ideas is a bit like trying to explain a vacuum cleaner to someone who has never seen one, except you're only allowed to use words that are four letters long or shorter.

What can you say?

mattt

Generate the list yourself:

$ cd /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS*.sdk/System/Library/Frameworks/UIKit.framework/Headers
$ grep UI_APPEARANCE_SELECTOR ./*     | \
  sed 's/NS_AVAILABLE_IOS(.*)//g'     | \
  sed 's/NS_DEPRECATED_IOS(.*)//g'    | \
  sed 's/API_AVAILABLE(.*)//g'        | \
  sed 's/API_UNAVAILABLE(.*)//g'      | \
 sed 's/UI_APPEARANCE_SELECTOR//g' | \

bjhomer

Imagine that a number line lives on a 2D plane. "Positive" on the number line is in the 0° direction, and "Negative" on the number line is in the 180° direction.

"1" is a vector of length 1, pointing in the direction 0°.

"-3" is a vector of length 3, pointing in the direction 180°.

Multiplication of these vectors can be understood as multiplying the lengths and adding the angle of each vector.

"1 * -3" is a vector of length (1*3 = 3), pointing in the direction (0° + 180° = 180°). In other words, "1 * -3" is a vector of length 3, pointing in the negative direction.

odrobnik

- (NSAttributedString *)attributedStringWithString:(NSString *)string highlightedwithOccurencesOfString:(NSString *)stringToHighlight inColor:(DTColor *)color
{
  // build an attributed string to start with
	
	// font
	DTCoreTextFontDescriptor *fontDesc = [[DTCoreTextFontDescriptor alloc] init];
	fontDesc.fontFamily = @"Helvetica";
	fontDesc.pointSize = 20;
	
	// paragraph style

steipete

// Taken from the commercial iOS PDF framework http://pspdfkit.com.
// Copyright (c) 2014 Peter Steinberger, PSPDFKit GmbH. All rights reserved.
// Licensed under MIT (http://opensource.org/licenses/MIT)
//
// You should only use this in debug builds. It doesn't use private API, but I wouldn't ship it.

// PLEASE DUPE rdar://27192338 (https://openradar.appspot.com/27192338) if you would like to see this in UIKit.

#import <objc/runtime.h>
#import <objc/message.h>

boredzo

100	Keynote
101	Platforms State of the Union
102	Apple Design Awards
109	Painting the Future
200	Accessibility in OS X
201	Building User Interfaces for iOS 7
202	Accessibility in iOS
203	What’s New in Cocoa Touch
204	What’s New with Multitasking
205	What’s New in Cocoa

brentsimmons

@implementation UITextView (RSExtras)


static BOOL stringCharacterIsAllowedAsPartOfLink(NSString *s) {

    /*[s length] is assumed to be 0 or 1. s may be nil.
     Totally not a strict check.*/

    if (s == nil || [s length] < 1)
        return NO;

steipete

static BOOL PSPDFIsDevelopmentBuild(void) {
#if TARGET_IPHONE_SIMULATOR
    return YES;
#else
    static BOOL isDevelopment = NO;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        // There is no provisioning profile in AppStore Apps.
        NSData *data = [NSData dataWithContentsOfFile:[NSBundle.mainBundle pathForResource:@"embedded" ofType:@"mobileprovision"]];
        if (data) {

indragiek

//
//  DynamicTypeLabel.swift
//
//  Created by Indragie on 10/16/14.
//  Copyright (c) 2014 Indragie Karunaratne. All rights reserved.
//

import UIKit

class DynamicTypeLabel : UILabel {

andymatuschak

//
//  MultiDirectionAdjudicatingScrollView.swift
//  Khan Academy
//
//  Created by Andy Matuschak on 12/16/14.
//  Copyright (c) 2014 Khan Academy. All rights reserved.
//

import UIKit
import UIKit.UIGestureRecognizerSubclass