Roberto Abraham Scaruffi

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How did Pythagoras arrive at the Pythagorean theorem? David Joyce, always learning 43 votes Calling it the "Pythagorean theorem" when speaking of it historically like this is anachronistic. A better term would be the "rule of the right triangle" because (1) other... Read More » What are the most effective ways to combat elite troops such as Navy SEAL or SAS units? Jon Mixon 173 votes Remove the element of surprise. Special Forces groups are small and they depend heavily upon maintaining secrecy and the element of surprise when undertaking their mission... Read More » What's new in C++ 14 standards? Olivia Ifrim 153 votes After some quick reading, here's what I found Generic lambdas - you can now write lambda parameters with an auto type and the compiler will figure things out. Lambdas param...  Read More » How can one prove that  without using mathematical induction? Carlos Shine 137 votes Tough question! Let's do a counting problem instead. How many rectangles in the cartesian plane have sides parallel to the axes and vertices with coordinates that are inte... Read More » What's wrong in this equation?  now differentiate w.r.t. 'x' both sides So, . Is this mathematically valid? Massey Cashore 123 votes A lot of people have pointed out there is an implicit "x" in the LHS of the equation, but no one has shown how to properly differentiate it yet. Consider the function . T... Read More » What do software developers age 30 and over know now that they wish they had known in their 20s? David Mitchell, Futures trader, software guy, blunder... 74 votes Most of the time at work, I'm right and the person arguing with me is wrong. Often that's because they don't have all the facts that I do, so deal with that rather than arg...  Read More » What is the best way to learn JavaScript practically? Alex Jansen 1k votes 1) Build shit! Get an account on Google App Engine, and start launching real web apps, with real CRUD features. 2) AVOID JQUERY. Try as much as you can to write javascript ... Read More » How do you save money on food? Joe Geronimo Martinez 29 votes I've got my food bills down to £10/$15 a week, I'm not exactly starving and it isn't difficult, nor does it involve "weird" food. If something goes off in a shop, it's the... Read More » What is the proof of ? Josh Alman, MIT Math Major 373 votes I'm going to assume that a and b are positive, as specified in the comments. The limit doesn't even exist if the one of a and b with bigger magnitude is negative. Let's as... Read More » What is the difference between L1 and L2 regularization? Justin Solomon, PhD student, Computer Science 81 votes There are many ways to understand the need for and approaches to regularization. I won't attempt to summarize the ideas here, but you should explore statistics or machine ... Read More »