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.
No even number greater than 2 is prime because by definition, as any such even number n has at least three distinct divisors, namely 1, 2, and n. Accordingly, the term odd prime refers to any prime number greater than 2. Similarly, when written in the usual decimal system, all prime numbers larger than 5 would end in 1, 3, 7, or 9, since even numbers are multiples of 2, and numbers ending in 0 or 5 are multiples of 5.