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okay in this video Im going to talk about something from whats sometimes called abstract or modern algebra which is called a group so a group is a set of elements G with an operation a binary operation star on G such that we have the following four criteria first is its closure if you take any two elements in the group and you apply this operation you get a unique element still in the group associativity it says if we take B star C and then take a star that result will get the same thing as if we basically combine a and B first and then do C it says theres an identity element in the set so that when you apply the identity element to any element you just get the same element back and then it says for every element in the set theres there exists an and inverse element so that when you take the inverse in the original you get the identity element so in this example were going to look at the set of real numbers and were going to exclude the number negative 1 and were going to show
