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In von Neumann's set-theoretic construction of the natural numbers, the number 1 is defined as the singleton {}. In axiomatic set theory , the existence of singletons is a consequence of the axiom of pairing : for any set A , the axiom applied to A and A asserts the existence of { A , A } , {\displaystyle \{A,A\},} which is the same as the ...
The first versions (Blocks 1 and 1B) of the Space Launch System (SLS) use a pair of five-segment Solid Rocket Boosters (SRBs), which were developed from the four-segment SRBs used for the Shuttle. Modifications for the SLS included the addition of a center booster segment, new avionics, and new insulation which eliminates the Shuttle SRB's ...