通过2个无穷可数个无穷小量的积及2个无穷可数个无穷小量的和的实例，证明了无穷可数个无穷小量的积或者和均不一定是无穷小量。%For two examples of in either of which there are infinite infinitesimals whose product are not an infinitesimal, and two other examples in either of which there are infinite infinitesimals whose sum are not an infinitesimal, it is obtained that the product (sum) of infinite infinitesimals is not necessarily an infinitesimal.
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