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<H3> Constructors for abstract values of level 1 </H3>
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<DT><U>Function:</U> ap_abstract1_t <B>ap_abstract1_bottom</B> <I>(ap_manager_t* <VAR>man</VAR>, ap_environment_t* <VAR>env</VAR>)</I>
<DD><A NAME="IDX305"></A>
<DT><U>Function:</U> ap_abstract1_t <B>ap_abstract1_top</B> <I>(ap_manager_t* <VAR>man</VAR>, ap_environment_t* <VAR>env</VAR>)</I>
<DD>Create resp. a bottom (empty) value and a top (universe) value defined
on the environment <VAR>env</VAR>.
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<A NAME="IDX306"></A>
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<DT><U>Function:</U> ap_abstract1_t <B>ap_abstract1_of_box</B> <I>(ap_manager_t* <VAR>man</VAR>, ap_environment_t* <VAR>env</VAR>, ap_var_t* <VAR>tvar</VAR>, ap_interval_t** <VAR>tinterval</VAR>, size_t <VAR>size</VAR>)</I>
<DD>Abstract an hypercube defined by the arrays <VAR>tvar</VAR> and
<VAR>tintnerval</VAR> of size <VAR>size</VAR>.
</P><P>
If no inclusion is specified for a variable in the environment, its
value is no constrained in the resulting abstract value.
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