Specifically we prove if R#92;geq 1 there is no #92;psi#92;in#92;text#123;Cont#125;(#92;mathbb#123;R#125;#123;2n#125;#92;timesS¹), the group of compactly supported contactomorphisms of #92;mathbb#123;R#125;#123;2n#125;#92;timesS¹ which squeezes 1 into itself, i.e. maps the closure of #92;widehat#123;B#125;(R) into #92;widehat#123;B#125;(R).
Source: wiktionary