Fréchet filter

Alright kiddo, imagine you are trying to catch fish using a filter. A fréchet filter is like a special filter that helps you catch only certain types of fish.

Now, let's say you have a big bucket of water with all sorts of fish in it. Some of these fish are small, some are big, and some are in between. Each fish has a certain size, right?

A fréchet filter works by only letting fish pass through that are of a certain size or larger. So, for example, if you set the filter to only let through fish that are 10 inches or longer, any fish that are smaller than 10 inches will be caught in the filter and won't make it through.

The filter works by measuring the distance between each fish and the size you set the filter to. If the distance between the fish and the size you set is less than or equal to a certain value, the fish will be let through. If the distance is greater than the value, the fish will be caught in the filter.

In other words, a fréchet filter helps you catch only the fish of a certain size or larger. This can be useful if you are studying a specific type of fish or if you want to catch only certain types of fish for cooking or eating.