diff --git a/src/stlcg.py b/src/stlcg.py
index 504065f..22c7538 100644
--- a/src/stlcg.py
+++ b/src/stlcg.py
@@ -5,9 +5,10 @@
 import IPython
 # Assume inputs are already reversed.
 
-# Nikos TODO:
+# TODO:
 # - Edit the "forward" methods to account for the possibility that they are receiving an input of type Expression
 # - Run tests to ensure that "Expression" correctly overrides operators
+# - Make a test for each temporal operator, and make sure that they all produce the expected output for at least one example trace
 # - Implement log-barrier
 
 LARGE_NUMBER = 1E4
@@ -178,7 +179,7 @@ def _next_function(self):
         return [self.subformula]
 
     def forward(self, x, scale=0):
-        if isintance(x, Expression):
+        if isinstance(x, Expression):
             return self.robustness_trace(x.value, scale)
         else:    
             return self.robustness_trace(x, scale)
@@ -285,7 +286,7 @@ def _next_function(self):
         return [self.name, self.c]
 
     def forward(self, x, scale=1):
-        if isinstance(x, expression):
+        if isinstance(x, Expression):
             return self.robustness_trace(x.value, scale)
         else:
             return self.robustness_trace(x, scale)
@@ -356,7 +357,10 @@ def _next_function(self):
         return [self.subformula]
 
     def forward(self, x, scale=1):
-        return self.robustness_trace(x, scale)
+        if isinstance(x, Expression):
+            return self.robustness_trace(x.value, scale)
+        else:
+            return self.robustness_trace(x, scale)
 
     def __str__(self):
         return "¬(" + str(self.subformula) + ")"
@@ -399,7 +403,14 @@ def _next_function(self):
         return [self.subformula1, self.subformula2]
 
     def forward(self, trace1, trace2, scale=0):
-        return self.robustness_trace(trace1, trace2, scale)
+        if isinstance(trace1, Expression) and isinstance(trace2, Expression):
+            return self.robustness_trace(trace1.value, trace2.value, scale)
+        elif isinstance(trace1, Expression):
+            return self.robustness_trace(trace1.value, trace2, scale)
+        elif isinstance(trace2, Expression):
+            return self.robustness_trace(trace1, trace2.value, scale)
+        else:
+            return self.robustness_trace(trace1, trace2, scale)
 
     def __str__(self):
         return "(" + str(self.subformula1) + ") ∧ (" + str(self.subformula2) + ")"
@@ -442,7 +453,14 @@ def _next_function(self):
         return [self.subformula1, self.subformula2]
 
     def forward(self, trace1, trace2, scale=0):
-        return self.robustness_trace(trace1, trace2, scale)
+        if isinstance(trace1, Expression) and isinstance(trace2, Expression):
+            return self.robustness_trace(trace1.value, trace2.value, scale)
+        elif isinstance(trace1, Expression):
+            return self.robustness_trace(trace1.value, trace2, scale)
+        elif isinstance(trace2, Expression):
+            return self.robustness_trace(trace1, trace2.value, scale)
+        else:
+            return self.robustness_trace(trace1, trace2, scale)
 
     def __str__(self):
         return "(" + str(self.subformula1) + ") ∨ (" + str(self.subformula2) + ")"
@@ -494,7 +512,14 @@ def _next_function(self):
         return [self.subformula1, self.subformula2]
 
     def forward(self, trace1, trace2, scale=0):
-        return self.robustness_trace(trace1, trace2, scale)
+        if isinstance(trace1, Expression) and isinstance(trace2, Expression):
+            return self.robustness_trace(trace1.value, trace2.value, scale)
+        elif isinstance(trace1, Expression):
+            return self.robustness_trace(trace1.value, trace2, scale)
+        elif isinstance(trace2, Expression):
+            return self.robustness_trace(trace1, trace2.value, scale)
+        else:
+            return self.robustness_trace(trace1, trace2, scale)
 
     def __str__(self):
         return  "(" + str(self.subformula1) + ")" + " U " + "(" + str(self.subformula2) + ")"
@@ -545,7 +570,14 @@ def _next_function(self):
         return [self.subformula1, self.subformula2]
 
     def forward(self, trace1, trace2, scale=0):
-        return self.robustness_trace(trace1, trace2, scale)
+        if isinstance(trace1, Expression) and isinstance(trace2, Expression):
+            return self.robustness_trace(trace1.value, trace2.value, scale)
+        elif isinstance(trace1, Expression):
+            return self.robustness_trace(trace1.value, trace2, scale)
+        elif isinstance(trace2, Expression):
+            return self.robustness_trace(trace1, trace2.value, scale)
+        else:
+            return self.robustness_trace(trace1, trace2, scale)
 
     def __str__(self):
         return  "(" + str(self.subformula1) + ")" + " T " + "(" + str(self.subformula2) + ")"
@@ -607,7 +639,7 @@ def __truediv__(a, b):
     def __lt__(lhs, rhs):
         if isinstance(lhs, Expression) and isinstance(rhs, Expression):
             return LessThan(lhs.value, rhs.value) 
-        elif (not isinstance(lhs, Expression)) and (not isintance(rhs, Expression)):
+        elif (not isinstance(lhs, Expression)) and (not isinstance(rhs, Expression)):
             # This case cannot occur. If neither is an Expression, why are you calling this method?
             raise Exception('What are you doing?')
         elif not isinstance(rhs, Expression):
@@ -621,7 +653,7 @@ def __le__(lhs, rhs):
     def __gt__(lhs, rhs):
         if isinstance(lhs, Expression) and isinstance(rhs, Expression):
             return GreaterThan(lhs.value, rhs.value) 
-        elif (not isinstance(lhs, Expression)) and (not isintance(rhs, Expression)):
+        elif (not isinstance(lhs, Expression)) and (not isinstance(rhs, Expression)):
             # This case cannot occur. If neither is an Expression, why are you calling this method?
             raise Exception('What are you doing?')
         elif not isinstance(rhs, Expression):
@@ -635,7 +667,7 @@ def __ge__(lhs, rhs):
     def __eq__(lhs, rhs):
         if isinstance(lhs, Expression) and isinstance(rhs, Expression):
             return Equal(lhs.value, rhs.value)
-        elif (not isinstance(lhs, Expression)) and (not isintance(rhs, Expression)):
+        elif (not isinstance(lhs, Expression)) and (not isinstance(rhs, Expression)):
             # This case cannot occur. If neither is an Expression, why are you calling this method?
             raise Exception('What are you doing?')
         elif not isinstance(rhs, Expression):
diff --git a/stlcg demo.ipynb b/stlcg demo.ipynb
index 194291f..e6ab2c8 100644
--- a/stlcg demo.ipynb	
+++ b/stlcg demo.ipynb	
@@ -116,34 +116,34 @@
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        "<title>%3</title>\n",
        "<polygon fill=\"#ffffff\" stroke=\"transparent\" points=\"-4,4 -4,-92 130,-92 130,4 -4,4\"/>\n",
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        "</g>\n",
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+       "<!-- 4358179728 -->\n",
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        "</g>\n",
-       "<!-- 4508003216&#45;&gt;4904731984 -->\n",
+       "<!-- 4358179728&#45;&gt;4755286112 -->\n",
        "<g id=\"edge1\" class=\"edge\">\n",
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+       "<title>4358179728&#45;&gt;4755286112</title>\n",
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        "</g>\n",
-       "<!-- 4904772160 -->\n",
+       "<!-- 4755294248 -->\n",
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-       "<title>4904772160</title>\n",
+       "<title>4755294248</title>\n",
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        "<text text-anchor=\"middle\" x=\"99\" y=\"-74.4\" font-family=\"Times,serif\" font-size=\"12.00\" fill=\"#000000\">4.0</text>\n",
        "</g>\n",
-       "<!-- 4904772160&#45;&gt;4904731984 -->\n",
+       "<!-- 4755294248&#45;&gt;4755286112 -->\n",
        "<g id=\"edge2\" class=\"edge\">\n",
-       "<title>4904772160&#45;&gt;4904731984</title>\n",
+       "<title>4755294248&#45;&gt;4755286112</title>\n",
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@@ -151,7 +151,7 @@
        "</svg>\n"
       ],
       "text/plain": [
-       "<graphviz.dot.Digraph at 0x124577b38>"
+       "<graphviz.dot.Digraph at 0x11b6e7ba8>"
       ]
      },
      "execution_count": 4,
@@ -182,34 +182,34 @@
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        "</g>\n",
-       "<!-- 4904772232&#45;&gt;4904732040 -->\n",
+       "<!-- 4755294320&#45;&gt;4755286168 -->\n",
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@@ -217,7 +217,7 @@
        "</svg>\n"
       ],
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-       "<graphviz.dot.Digraph at 0x124577d68>"
+       "<graphviz.dot.Digraph at 0x105f4cdd8>"
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@@ -248,34 +248,34 @@
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        "<polygon fill=\"#ffffff\" stroke=\"transparent\" points=\"-4,4 -4,-92 130,-92 130,4 -4,4\"/>\n",
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+       "<!-- 4755294320&#45;&gt;4755286224 -->\n",
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@@ -283,7 +283,7 @@
        "</svg>\n"
       ],
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+       "<graphviz.dot.Digraph at 0x105f4c9e8>"
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@@ -314,97 +314,97 @@
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@@ -1039,20 +1039,20 @@
       "iteration: 159 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n",
       "iteration: 160 -- loss: 0.075 ---- c:3.984 ---- d:2.016\n",
       "iteration: 161 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n",
-      "iteration: 162 -- loss: 0.074 ---- c:4.016 ---- d:1.984\n"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
+      "iteration: 162 -- loss: 0.074 ---- c:4.016 ---- d:1.984\n",
       "iteration: 163 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n",
       "iteration: 164 -- loss: 0.073 ---- c:3.984 ---- d:2.016\n",
       "iteration: 165 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n",
       "iteration: 166 -- loss: 0.073 ---- c:4.016 ---- d:1.984\n",
       "iteration: 167 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n",
       "iteration: 168 -- loss: 0.072 ---- c:3.984 ---- d:2.016\n",
-      "iteration: 169 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n",
+      "iteration: 169 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
       "iteration: 170 -- loss: 0.072 ---- c:4.015 ---- d:1.985\n",
       "iteration: 171 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n",
       "iteration: 172 -- loss: 0.071 ---- c:3.985 ---- d:2.015\n",
@@ -1193,13 +1193,7 @@
       "iteration: 307 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n",
       "iteration: 308 -- loss: 0.037 ---- c:3.992 ---- d:2.008\n",
       "iteration: 309 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n",
-      "iteration: 310 -- loss: 0.037 ---- c:4.008 ---- d:1.992\n"
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-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
+      "iteration: 310 -- loss: 0.037 ---- c:4.008 ---- d:1.992\n",
       "iteration: 311 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n",
       "iteration: 312 -- loss: 0.036 ---- c:3.992 ---- d:2.008\n",
       "iteration: 313 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n",
@@ -1227,7 +1221,13 @@
       "iteration: 335 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n",
       "iteration: 336 -- loss: 0.031 ---- c:3.993 ---- d:2.007\n",
       "iteration: 337 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n",
-      "iteration: 338 -- loss: 0.030 ---- c:4.007 ---- d:1.993\n",
+      "iteration: 338 -- loss: 0.030 ---- c:4.007 ---- d:1.993\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
       "iteration: 339 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n",
       "iteration: 340 -- loss: 0.030 ---- c:3.993 ---- d:2.007\n",
       "iteration: 341 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n",
@@ -1348,13 +1348,7 @@
       "iteration: 456 -- loss: 0.007 ---- c:3.998 ---- d:2.002\n",
       "iteration: 457 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n",
       "iteration: 458 -- loss: 0.007 ---- c:4.002 ---- d:1.998\n",
-      "iteration: 459 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
+      "iteration: 459 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n",
       "iteration: 460 -- loss: 0.007 ---- c:3.998 ---- d:2.002\n",
       "iteration: 461 -- loss: 0.000 ---- c:4.000 ---- d:2.000\n",
       "iteration: 462 -- loss: 0.006 ---- c:4.002 ---- d:1.998\n",
@@ -1415,6 +1409,13 @@
     "        d -= learning_rate * d.grad\n",
     "        d.grad.zero_()"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {