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Wacky Factorials

We all know the definition of the factorial ! as but there are even more definitions of factorials that mathematicians have invented. Double Factorial The double factorial looks like this . It can be used to easily denote the product of the odd or even numbers less than or equal to n     Subfactorial …

Reflected Gradient Formula

The inverse of a function can be found by swapping x and ys in an equation (and then rearrange back to terms of x). This has the effect of reflecting the original function in the line y = x, as you are essentially just swapping the x and y axis. Some mates and I sat …

Big Page on Vectors

A vector is a quantity with both direction and magnitude Vectors can also be denoted (xi + yj + zk) and the vector variable can be called The way you use a vector depends on if you are treating that vector as a position vector or a direction vector. A vector is a position vector …