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Avoiding username collision

The problem

Suppose you are launching a new web application. You have a list of users with personal information, and you need to mail them instructions for how to sign on to their new accounts. For security reasons, you cannot mail send both their username and password by mail.

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Making math make sense to programmers

Whether you're learning math for pleasure or profit (jumping on the Big Data bandwagon), there are times when it may seem intimidating, overwhelming, confounding, etc. My assertion is that if you think like a programmer, you already have a leg up when it comes to learning math.