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In differential calculus and differential geometry, an inflection point, point of inflection, flex, or inflection (British English: inflexion) is a point on a smooth plane curve at which the curvature changes sign. In particular, in the case of the graph of a function, it is a point where the function changes from being concave (concave downward) to convex (concave upward), or vice versa.

Inflection Point - Wikipedia

en.wikipedia.org

Men are like clouds. They are driven forward by a mysterious and invisible wind against which they are powerless. They think they are in control and laugh at the weakness of the clouds, but their wind is a thousand times stronger than the one blowing up there.

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Venture capitalists have a list of danger signs to watch out for. Near the top is the company run by techno-weenies who are obsessed with solving interesting technical problems, instead of making users happy. In a startup, you’re not just trying to solve problems. You’re trying to solve problems that users care about. So I think you should make users the test, just as acquirers do. Treat a startup as an optimization problem in which performance is measured by number of users. As anyone who has tried to optimize software knows, the key is measurement. When you try to guess where your program is slow, and what would make it faster, you almost always guess wrong.

Hackers & Painters - Big Ideas From the Computer Age

Paul Graham

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