- #1
mnb96
- 715
- 5
Hello,
given a function f:R->R, can anyone explain what is meant when we say that "f has compact support"?
Some sources seem to suggest that it means that f is non-zero only on a closed subset of R.
Other sources say that f vanishes at infinity. This definition seem to contradict the previous: for example the Gaussian is never 0 but does vanish at infinity.
So, where is the misunderstanding?
given a function f:R->R, can anyone explain what is meant when we say that "f has compact support"?
Some sources seem to suggest that it means that f is non-zero only on a closed subset of R.
Other sources say that f vanishes at infinity. This definition seem to contradict the previous: for example the Gaussian is never 0 but does vanish at infinity.
So, where is the misunderstanding?