add hw4

Author: Sungwoo Jeong

README.md

@@ -52,6 +52,7 @@ Submit your homework via canvas.mit.edu. If you are not enrolled in 18338 canvas
 | 1| 9/17 | 5,10,11| [HW1](https://github.com/mitmath/18338/blob/master/homeworks/fall2025hw1.pdf)|
 | 2| 9/25 | 7,13,14,21| [HW2](https://github.com/mitmath/18338/blob/master/homeworks/hw2_2025.pdf)|
 |3| 10/9 | 1,2,3 | [HW3](https://github.com/mitmath/18338/blob/master/homeworks/hw3_2025.pdf)|
+|4| 10/16 |  4   | [HW4](https://github.com/mitmath/18338/blob/master/homeworks/hw4_2025.pdf)|
 
 
 ## Research Questions

homeworks/hw3.aux

@@ -14,5 +14,6 @@
 \fi}
 \global\let\hyper@last\relax 
 \gdef\HyperFirstAtBeginDocument#1{#1}
-\providecommand*\HyPL@Entry[1]{}
-\HyPL@Entry{0<</S/D>>}
+\providecommand\HyField@AuxAddToFields[1]{}
+\providecommand\HyField@AuxAddToCoFields[2]{}
+\gdef \@abspage@last{2}