fixing math elements in appa

appa_whitepaper.adoc

@@ -181,7 +181,7 @@ The recipient waits until the transaction has been added to a block and z blocks
 
 ++++
 <div data-type="equation">
-<math display="block" class="tml-display" style="display:block math;">
+<math display="block" xmlns="http://www.w3.org/1998/Math/MathML" >
   <mstyle mathsize="1.2000em">
     <mi>λ</mi>
     <mo>=</mo>
@@ -199,7 +199,7 @@ To get the probability the attacker could still catch up now, we multiply the Po
 
 ++++
 <div data-type="equation">
-<math display="block" class="tml-display" style="display:block math;">
+<math display="block" xmlns="http://www.w3.org/1998/Math/MathML" >
   <mstyle mathsize="1.2000em">
     <mrow>
       <munderover>
@@ -290,7 +290,7 @@ Rearranging to avoid summing the infinite tail of the distribution...
 
 ++++
 <div data-type="equation">
-<math display="block" class="tml-display" style="display:block math;">
+<math display="block" xmlns="http://www.w3.org/1998/Math/MathML" >
   <mstyle mathsize="1.2000em">
     <mn>1</mn>
     <mo>−</mo>