Question: 2. [5 marks] Floors and ceilings. For all proofs in this question, you may use the following fact from Worksheet 5: VLEER,OS$L.'L'] [as] S [19']

2. [5 marks] Floors and ceilings. For all proofs in this question, you may use the following fact from Worksheet 5: VLEER,OS$L.'L'] [as] S [19'] ii. Vx,yER,]$] S [y] =>x$y

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