Diagram of simple filtration: oversize particles in the feed cannot pass through the lattice structure of the filter, while fluid and small particles pass through, becoming filtrate.
An odd function can be identified by replacing both the x and y values with -x and -y values. If the values in your equation are the opposite (positives are negatives and negatives are positives), then the function is odd. Take, for example, this equation y = x^2.
Even numbers are numbers that can be divided evenly by 2. Even numbers can be shown as a set like this: Odd numbers are numbers that cannot be divided evenly by 2. Odd numbers can be shown as a set like this: Zero is considered an even number.