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+# Scientific assertions
+
+>**Note**
+>If you need to deal with value minus zero, be very careful because Lua versions
+are inconsistent on how they treat the >syntax -0 : it creates either a plus
+zero or a minus zero. Multiplying or dividing 0 by -1 also yields inconsistent >
+results. The reliable way to create the -0 value is : minusZero = -1 / (1/0).
+
+* **_AFT.assertIsNaN(value)**
+    Assert that a given number is a *NaN* (Not a Number), according to the
+    definition of IEEE-754_ . If provided, *extra_msg* is a string which will
+    be printed along with the failure message.
+
+* **_AFT.assertIsPlusInf(value)**
+
+    Assert that a given number is *plus infinity*, according to the definition of
+    IEEE-754_. If provided, *extra_msg* is a string which will be printed along
+    with the failure message.
+
+* **_AFT.assertIsMinusInf(value)**
+
+    Assert that a given number is *minus infinity*, according to the definition of
+    IEEE-754_. If provided, *extra_msg* is a string which will be printed along
+    with the failure message.
+
+* **_AFT.assertIsInf(value)**
+
+    Assert that a given number is *infinity* (either positive or negative),
+    according to the definition of IEEE-754_. If provided, *extra_msg* is a string
+    which will be printed along with the failure message.
+
+* **_AFT.assertIsPlusZero(value)**
+
+    Assert that a given number is *+0*, according to the definition of IEEE-754_.
+    The verification is done by dividing by the provided number and verifying
+    that it yields *infinity* . If provided, *extra_msg* is a string which will
+    be printed along with the failure message.
+
+    Be careful when dealing with *+0* and *-0*, see note above
+
+* **_AFT.assertIsMinusZero(value)**
+
+    Assert that a given number is *-0*, according to the definition of IEEE-754_.
+    The verification is done by dividing by the provided number and verifying that
+    it yields *minus infinity* . If provided, *extra_msg* is a string which will
+    be printed along with the failure message.
+
+    Be careful when dealing with *+0* and *-0*
+\ No newline at end of file