Update index.html

Author: yimaeecs

Lecture-Slides/index.html

@@ -33,7 +33,7 @@ <h3> <font face="Arial,Helvetica"> by Yi Ma (for <a href="https://pages.github.b
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 <i> Now, be prepared for a journey from high-dimensional to low-dimensional, from linear to nonlinear, from convex to nonconvex, from shallow to deep, from idealistic to realistic, and from theoretical to practical. 
 Or, at a more technical and computational level, this is also a journey from L0, to L1, and to L4, from low-rank, to nuclear norm, and to coding rate, and from 
-  PCA, to GPCA, and to Nonlinear PCAs.</i> 
+  PCA, to multiple PCAs, and to Nonlinear PCAs.</i> 
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