**DADS 2nd level index page**
Up to Two-level Index

2-3-4 tree
2-3 tree
Two Way algorithm
two-way linked list: see doubly linked list
two-way merge sort
UB-tree
UKP: see unbounded knapsack problem
unary function
unbounded knapsack problem
uncomputable function
uncomputable problem
undecidable language
undecidable problem
undirected graph
uniform circuit complexity
uniform circuit family
uniform hashing
uniform matrix
union
union of automata
universal B-tree
universal hashing
universal state
universal Turing machine
universe