Want site search autocompletion? See here Encountering 429 Too Many Requests errors when browsing the site? See here
A prespectrum is a sequence T n {\displaystyle T_{n}} of based topological spaces indexed by nonnegative integers n {\displaystyle n} , along with based maps from the reduced suspension Σ T n {\displaystyle \Sigma T_{n}} of T n {\displaystyle T_{n}} , to T n + 1 {\displaystyle T_{n+1}} for each n {\displaystyle n} .
