define PGA when first used

index.html

@@ -76,13 +76,13 @@ <H1>Look, Ma, No Matrices!</H1>
       data-animB="4"
     ></SPAN>
 
-    <p>Since the 2019 SIGGRAPH course [1], Geometric Algebra, and Euclidean PGA in particular, 
-       has been gaining traction within the computer graphics and machine learning communities 
-       [2, 3, 4]. Despite its broad applicability, including for higher dimensional geometry 
-       and physics, its adoption in traditional 3D graphics has been limited, often merely re-branding a 
-       dual quaternion as a PGA motor. The ’Look, Ma, No Matrices!’ project aims to broaden PGA’s 
-       application by introducing a modern, glTF-compliant, forward-rendering 3D engine that fully 
-       integrates the PGA algebra.
+    <p>Since the 2019 SIGGRAPH course [1], Geometric Algebra, and Euclidean PGA (plane-based or 
+       projective geometric algebra) in particular, has been gaining traction within the computer 
+       graphics and machine learning communities [2, 3, 4]. Despite its broad applicability, 
+       including for higher dimensional geometry and physics, its adoption in traditional 3D 
+       graphics has been limited, often merely re-branding a dual quaternion as a PGA motor. 
+       The ’Look, Ma, No Matrices!’ project aims to broaden PGA’s application by introducing 
+       a modern, glTF-compliant, forward-rendering 3D engine that fully integrates the PGA algebra.
     </p>
 
     <p>In this write up, we will go over this project, highlighting the solutions and techniques that