diff --git a/.obsidian/app.json b/.obsidian/app.json
index a82c582..cf47506 100644
--- a/.obsidian/app.json
+++ b/.obsidian/app.json
@@ -1,7 +1,7 @@
 {
   "promptDelete": false,
   "newLinkFormat": "relative",
-  "attachmentFolderPath": "./assets/数组",
+  "attachmentFolderPath": "./assets/基础概念",
   "showUnsupportedFiles": false,
   "newFileLocation": "current",
   "useMarkdownLinks": true,
diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index a0444d7..90ebb32 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -13,7 +13,7 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "Books/代码随想录/数组.md",
+                "file": "Books/动手学深度学习/基础概念.md",
                 "mode": "source",
                 "source": false
               }
@@ -77,8 +77,7 @@
       }
     ],
     "direction": "horizontal",
-    "width": 315.5,
-    "collapsed": true
+    "width": 315.5
   },
   "right": {
     "id": "c501495747cfa761",
@@ -94,7 +93,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "Books/代码随想录/数组.md",
+                "file": "Books/动手学深度学习/基础概念.md",
                 "collapseAll": false,
                 "extraContext": false,
                 "sortOrder": "alphabetical",
@@ -111,7 +110,7 @@
             "state": {
               "type": "outgoing-link",
               "state": {
-                "file": "Books/代码随想录/数组.md",
+                "file": "Books/动手学深度学习/基础概念.md",
                 "linksCollapsed": false,
                 "unlinkedCollapsed": true
               }
@@ -134,7 +133,7 @@
             "state": {
               "type": "outline",
               "state": {
-                "file": "Books/代码随想录/数组.md"
+                "file": "Books/动手学深度学习/基础概念.md"
               }
             }
           },
@@ -165,12 +164,14 @@
       "notion-like-tables:Create loom": false
     }
   },
-  "active": "768c7ad67bbbb63e",
+  "active": "37c3469d51811935",
   "lastOpenFiles": [
+    "Books/动手学深度学习/引言.md",
+    "Study/DL/动手学深度学习/预备知识.md",
+    "Books/动手学深度学习/基础概念.md",
     "Books/代码随想录/数组.md",
     "Books/代码随想录",
     "Books/Untitled.md",
-    "Study/DL/动手学深度学习/预备知识.md",
     "Paper/Diffusion/Diffusion Models： A Comprehensive Survey of Methods and Applications.md",
     "Study/DL/动手学深度学习",
     "Paper/Untitled.md",
@@ -179,8 +180,6 @@
     "Paper/CLIP/Open-Vocabulary Semantic Segmentation.md",
     "Paper/CLIP/Learning Transferable Visual Models From Natural Language Supervision.md",
     "Paper/CLIP",
-    "Books/动手学深度学习/引言.md",
-    "Books/动手学深度学习/基础概念.md",
     "Paper/Open-Vocabulary Semantic Segmentation.md",
     "liangOpenVocabularySemanticSegmentation2023.md",
     "Paper/未命名.md",
diff --git a/Books/动手学深度学习/基础概念.md b/Books/动手学深度学习/基础概念.md
index da97d30..3252dad 100644
--- a/Books/动手学深度学习/基础概念.md
+++ b/Books/动手学深度学习/基础概念.md
@@ -11,3 +11,4 @@ $L(\mathbf{w}, b) = \frac1n\sum_{i=1}^{n} l^i(\mathbf{x}, b)$
   $(\mathbf{w}, b) <- (\mathbf{w},b) - \frac{\eta}{|B|} \sum_{i\in{B}}\partial_{(\mathbf{w}, b)}l^i(\mathbf{w},b)$
   其中$\eta$代表学习率
 # 激活函数
+在MLP中，由于多个线性层叠加，最终的结果和单层感知机并无区别，加入激活函数后，可以破坏这种线性叠加。
\ No newline at end of file
diff --git a/Books/动手学深度学习/引言.md b/Books/动手学深度学习/引言.md
deleted file mode 100644
index e69de29..0000000
diff --git a/Study/DL/动手学深度学习/预备知识.md b/Study/DL/动手学深度学习/预备知识.md
deleted file mode 100644
index 5fa12e4..0000000
--- a/Study/DL/动手学深度学习/预备知识.md
+++ /dev/null
@@ -1,4 +0,0 @@
-# 矩阵计算
-| $y$ | $a$ | $au$ | sum(x) |  |
-| ---- | ---- | ---- | ---- | ---- |
-| $\frac{\partial y}{\partial \mathbf x}$ | $0^T$ | $a \frac{\partial u}{\partial \mathbf x}$ | $1^T$ |  |