A number, in math, can come from measuring, counting, observing, watching, listening, dreaming, intuition, guess, random selection, ...

Limit, in math, and hence derivative and integral, are defined by incorporating a "PICK" operation in the sequence of required operations.

Pick a wrong number, and no matter how accurate your addition, subtraction, multiplication, or division is, result may be useless.

Before you add subtract, multiply, or divide, you have to pick a number. PICKING a number is very important mathematics operation.

In addition to +, -, * and /, there is one more important operation in math: PICK a number! That is how limit in calculus is defined!

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