diff --git a/src/math/lp/monomial_bounds.cpp b/src/math/lp/monomial_bounds.cpp
index 86f3de65a..09bed9554 100644
--- a/src/math/lp/monomial_bounds.cpp
+++ b/src/math/lp/monomial_bounds.cpp
@@ -6,7 +6,6 @@
   Lev Nachmanson (levnach)
 
   --*/
-#pragma once
 
 #include "math/lp/monomial_bounds.h"
 #include "math/lp/nla_core.h"
diff --git a/src/math/lp/nla_basics_lemmas.cpp b/src/math/lp/nla_basics_lemmas.cpp
index f77c99097..31a819b85 100644
--- a/src/math/lp/nla_basics_lemmas.cpp
+++ b/src/math/lp/nla_basics_lemmas.cpp
@@ -468,7 +468,7 @@ void basics::basic_lemma_for_mon_zero_model_based(const monic& rm, const factori
     } else {
         lemma |= ineq(var(rm), llc::NE, 0);
         for (auto j : f) {
-            lemma.explain_separation_from_zero(var(j));
+            lemma.explain_var_separated_from_zero(var(j));
         }            
     }
     lemma &= f;
diff --git a/src/math/lp/nla_core.cpp b/src/math/lp/nla_core.cpp
index def72518f..08f3841d9 100644
--- a/src/math/lp/nla_core.cpp
+++ b/src/math/lp/nla_core.cpp
@@ -1192,17 +1192,6 @@ new_lemma& new_lemma::explain_existing_upper_bound(lpvar j) {
     return *this;
 }
     
-new_lemma& new_lemma::explain_separation_from_zero(lpvar j) {
-    SASSERT(!c.val(j).is_zero());
-    if (c.val(j).is_pos())
-        explain_existing_lower_bound(j);
-    else
-        explain_existing_upper_bound(j);
-    return *this;
-}
-
-
-
 std::ostream& new_lemma::display(std::ostream & out) const {
     auto const& lemma = current();
 
diff --git a/src/math/lp/nla_core.h b/src/math/lp/nla_core.h
index 6dbf9e757..669f26114 100644
--- a/src/math/lp/nla_core.h
+++ b/src/math/lp/nla_core.h
@@ -108,7 +108,6 @@ public:
     new_lemma& explain_var_separated_from_zero(lpvar j);
     new_lemma& explain_existing_lower_bound(lpvar j);
     new_lemma& explain_existing_upper_bound(lpvar j);    
-    new_lemma& explain_separation_from_zero(lpvar j);
 
     lp::explanation& expl() { return current().expl(); }