ananaslatex2259692ananas
题号: nGCp

设/ananas/latex/p/2259692,/ananas/latex/p/2259715,/ananas/latex/p/88734,/ananas/latex/p/2259731是n/ananas/latex/p/9901个拓扑空间,则X=/ananas/latex/p/220576/ananas/latex/p/142/ananas/latex/p/963371/ananas/latex/p/142/ananas/latex/p/88734/ananas/latex/p/142/ananas/latex/p/2259790的以子集族/ananas/latex/p/609185={/ananas/latex/p/757761/ananas/latex/p/142/ananas/latex/p/757762/ananas/latex/p/142/ananas/latex/p/88734/ananas/latex/p/142/ananas/latex/p/2259853∣/ananas/latex/p/2259871,i=1,2,/ananas/latex/p/88734,n}为

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