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What goes in the gap?

Lara Alcock wrote about Tilting the Classroom in the London Mathematical Society Newsletter. One of the activities she does that I don’t do but should is what I’ll call What goes in the gap? from her section on deciding. The example she gives is which symbol of Image may be NSFW.
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\Longleftarrow
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\Longrightarrow
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\iff
goes in the gap in


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(a_n)\to a\qquad  (|a_n|)\to |a| .


Clearly one can do this with many other statements not just symbolic ones

For Image may be NSFW.
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\Phi :R ^n \to R ^n
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\Phi
is orthogonal         Image may be NSFW.
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\Phi
is an isometry.

Alcock recommends that students vote on the answers to encourage engagement and notes that sometimes multiple rounds of voting are required!

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