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    <p>Yes, you're right, you want to <code>pop</code> (remove) the last assertion. To do this, you first need to save the current set of assertions with <code>push</code>. This is how Z3 supports scope.</p> <p>By add some part of the formula, I'm going to assume you mean to define a variable containing an additional chunk of some original large formula you're doing the incremental checking on. I'll also assume the original formula is a large conjunction of sub-formulas. This new formula will remain defined between pushes and pops (assuming you keep a variable referencing it).</p> <p>Here is a link to an example of roughly the following pseudo-code in z3py, except in the z3py script I also assume the formula and the constraint are actually the same thing, but maybe you want to create some different constraint based on that piece of the subformula: <a href="http://rise4fun.com/Z3Py/LIxW" rel="nofollow noreferrer">http://rise4fun.com/Z3Py/LIxW</a></p> <p>I haven't used Scala^Z3, but roughly you want to do the following:</p> <pre><code>formula // list containing parts (sub-formulas) of original large formula while (formulaPart = formula.removeFirst()) // remove first element of list Z3Context.push() // save current set of assertions assertion = makeConstraint( formulaPart ) // assertion based on sub-formula Z3Context.assertCnstr( assertion ) // add new assertion if !Z3Context.check() // check if assertions cannot be satisfied Z3Context.pop() // remove most recent assertion </code></pre> <p>Here is an example using pop/push from the .NET API: <a href="http://research.microsoft.com/en-us/um/redmond/projects/z3/test__managed_8cs_source.html#l00637" rel="nofollow noreferrer">http://research.microsoft.com/en-us/um/redmond/projects/z3/test__managed_8cs_source.html#l00637</a></p> <p>You'd also be interested in this: <a href="https://stackoverflow.com/questions/8439556/soft-hard-constraints-in-z3">Soft/Hard constraints in Z3</a></p>
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    1. POScala^Z3: Delete previous assertion
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    1. COThx a lot, that answer really helped me out! I did a push() between adding the assertion and the pop(), but now you showed me how to do it, its working! :)
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