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   <title>Specification: BQN inferred properties</title>
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 <h1 id="specification-bqn-inferred-properties">Specification: BQN inferred properties</h1>
 <p>BQN includes some simple deductive capabilities: detecting the type of empty array elements, the result of an empty reduction, and the Undo (<code><span class='Modifier'>⁼</span></code>) and Under (<code><span class='Modifier2'>⌾</span></code>) modifiers. These tasks are a kind of proof-based or constraint programming, and can never be solved completely (some instances will be undecidable) but can be solved in more instances by ever-more sophisticated algorithms. To allow implementers to develop more advanced implementations while offering some stability and portability to programmers, two kinds of specification are given here. First, constraints are given on the behavior of inferred properties. These are not exact and require some judgment on the part of the implementer. Second, behavior for common or useful cases is specified more precisely. Non-normative suggestions are also given as a reference for implementers.</p>
 <p>For the specified cases, the given functions and modifiers refer to those particular representations. It is not necessary to detect equivalent representations, for example to reduce <code><span class='Paren'>(</span><span class='Function'>+-×</span><span class='Paren'>)</span><span class='Modifier'>⁼</span></code> to <code><span class='Function'>∨</span><span class='Modifier'>⁼</span></code>. However, it is necessary to identify computed functions and modifiers: for example <code><span class='Function'>F</span><span class='Modifier'>⁼</span></code> when the value of <code><span class='Function'>F</span></code> in the expression is <code><span class='Function'>∨</span></code>, or <code><span class='Paren'>(</span><span class='Number'>1</span><span class='Function'>⊑∧</span><span class='Ligature'>‿</span><span class='Function'>∨</span><span class='Paren'>)</span><span class='Modifier'>⁼</span></code>.</p>