diff --git a/nbs/docs/models/ARCH.ipynb b/nbs/docs/models/ARCH.ipynb
index 2d61a2fe3..789113d4c 100644
--- a/nbs/docs/models/ARCH.ipynb
+++ b/nbs/docs/models/ARCH.ipynb
@@ -673,7 +673,7 @@
    "source": [
     "### Return Series\n",
     "\n",
-    "Since the 1970s, the financial industry has been very prosperous with advancement of computer and Internet technology. Trade of financial products (including various derivatives) generates a huge amount of data which form financial time series. For finance, the return on a financial product is most interesting, and so our attention focuses on the return series. If {Pt } is the closing price at time t for a certain financial product, then the return on this product is\n",
+    "Since the 1970s, the financial industry has been very prosperous with advancement of computer and Internet technology. Trade of financial products (including various derivatives) generates a huge amount of data which form financial time series. For finance, the return on a financial product is most interesting, and so our attention focuses on the return series. If \\{Pt } is the closing price at time t for a certain financial product, then the return on this product is\n",
     "\n",
     "$$X_t = \\frac{(P_t − P_{t−1})}{P_{t−1}} ≈ log(P_t ) − log(P_{t−1}).$$\n",
     "\n",
@@ -12906,7 +12906,7 @@
           0.11683902533544767,
           0.18038662130227442,
           1.1396760668737118,
-          8.429606751246858e-06,
+          0.000008429606751246858,
           0.9301650273653356,
           0.16603494698002158,
           0.02552244687162859,
@@ -13023,7 +13023,7 @@
           0.333507961464413,
           1.5341682132027463,
           0.535647628131223,
-          8.047187854454163e-06,
+          0.000008047187854454163,
           0.05159803214177818,
           0.07600424912094962,
           0.05061172231156831,
@@ -13163,7 +13163,7 @@
           2.7279986776819762,
           2.7160487251081724,
           0.21768883267417796,
-          6.77720693099992e-06,
+          0.00000677720693099992,
           2.0892382083596366,
           1.5511137261921708,
           0.19711705562956672,
@@ -13207,7 +13207,7 @@
           0.09514048933694128,
           0.005799502263676435,
           0.26977917189300543,
-          2.2905689893454364e-05,
+          0.000022905689893454364,
           0.032835101620127545,
           0.035071983113154785,
           0.02720364389284937,
@@ -13299,7 +13299,7 @@
           0.2733247895916533,
           0.03816868105362628,
           0.05644730956949203,
-          1.7126891073291785e-05,
+          0.000017126891073291785,
           0.17648748135786346,
           0.08890408218010715,
           0.00021428585381320998,
@@ -13310,7 +13310,7 @@
           0.0034536384504556326,
           1.0219740565421616,
           0.14230208866334162,
-          3.4607522944888557e-06,
+          0.0000034607522944888557,
           0.0008948379096681811,
           1.1918442949862227,
           0.4224720090152985,
@@ -13334,7 +13334,7 @@
           0.379505710351215,
           0.04804736114077823,
           0.018926161782214495,
-          7.079826049627675e-05,
+          0.00007079826049627675,
           0.2256097560481151,
           0.14422736286851592,
           0.03029031934041486,
@@ -13469,7 +13469,7 @@
           0.016163575341260606,
           0.0033884362508481143,
           0.16717428315038643,
-          1.4022086968800128e-05,
+          0.000014022086968800128,
           0.010511348063911363,
           0.012782595072851783,
           0.04677744379099467,
@@ -13517,7 +13517,7 @@
           0.5337190473107196,
           0.03514066158205324,
           0.21841633296069093,
-          2.799770311426146e-05,
+          0.00002799770311426146,
           0.0035743299293066215,
           0.2886525495692123,
           0.0002361118071194596,
@@ -13567,7 +13567,7 @@
           0.09277613223137564,
           0.004196366830944074,
           0.04937508180038409,
-          5.208049534825782e-05,
+          0.00005208049534825782,
           0.16688400504491227,
           0.014510991850446027,
           0.13727838266375458,
@@ -13710,7 +13710,7 @@
           0.006911690943276298,
           0.3278850494791402,
           0.7287238222344438,
-          3.161982797127493e-05,
+          0.00003161982797127493,
           1.7903942515655977,
           0.033747867911173186,
           1.0887262880763404,
@@ -13821,7 +13821,7 @@
           0.017032753347700658,
           0.10819350754652532,
           0.07635754962107597,
-          4.720076651680163e-07,
+          4.720076651680163e-7,
           0.13257647932461017,
           0.0015736305321550584,
           0.005062602892380193,
@@ -13876,7 +13876,7 @@
           0.0003997208956144086,
           3.6430248324576744,
           4.315374983468133,
-          7.465081431494341e-05,
+          0.00007465081431494341,
           2.3702802404040986,
           2.4875933720473613,
           4.238751501049985,
@@ -13947,14 +13947,14 @@
           0.12884377091778848,
           0.45350527664342116,
           1.3383250835766,
-          3.047038069794671e-06,
+          0.000003047038069794671,
           0.046155230627765706,
           0.04345704527385812,
           0.21496506713259997,
           0.010971728644473754,
           0.3681449089203887,
           0.12095591183388035,
-          1.4533571009694057e-05,
+          0.000014533571009694057,
           0.43683167649436533,
           0.003961054815055465,
           0.002594457624136788,
@@ -14057,7 +14057,7 @@
           1.1755067590686328,
           1.692552536701068,
           0.008292017842472079,
-          8.837910181512196e-05,
+          0.00008837910181512196,
           0.0010388011063882155,
           0.52268289783404,
           0.08289521198197039,
@@ -14065,9 +14065,9 @@
           0.09831904474102832,
           0.06665444896152177,
           0.0011743773216012492,
-          3.989948937286202e-06,
+          0.000003989948937286202,
           0.23966670389611294,
-          9.396568391014351e-05,
+          0.00009396568391014351,
           0.7083530264126577,
           0.379280036868932,
           0.05899634912283012,
@@ -14125,7 +14125,7 @@
           0.012032641276976222,
           0.08457382662710584,
           0.73534494099483,
-          5.26813972937628e-05,
+          0.0000526813972937628,
           0.5109083285028833,
           0.0011242101166246262,
           0.0018688345123409381,
@@ -14134,7 +14134,7 @@
           0.0075020470243941095,
           0.00038200004553110315,
           0.26298092501994424,
-          1.1549731265675906e-05,
+          0.000011549731265675906,
           0.33417910089435754,
           0.0867904320408933,
           0.7020433764156192,
@@ -14609,7 +14609,7 @@
           0.6766417031004891,
           0.0030353502921928455,
           0.52166759677021,
-          1.1534388436087901e-06,
+          0.0000011534388436087901,
           0.1494000082288102,
           0.06768454071199759,
           0.11456736834367175,
@@ -14960,13 +14960,13 @@
           0.06211911053832683,
           0.12810408947533514,
           0.009926192984207037,
-          1.7100299484364275e-05,
+          0.000017100299484364275,
           0.17097265655211852,
           1.7589894800913939,
           0.042823064448460374,
           0.10930672666497082,
           0.007314017675982816,
-          7.100057638853501e-05,
+          0.00007100057638853501,
           0.3543283102780241,
           0.00815750397918031,
           0.00725186857060821,
@@ -14994,7 +14994,7 @@
           0.5356191175456438,
           0.7669523057389738,
           1.7027866477021951,
-          2.756746937148935e-06,
+          0.000002756746937148935,
           0.3731529145352457,
           0.9711025783145061,
           2.1124949696707556,
diff --git a/nbs/src/core/models.ipynb b/nbs/src/core/models.ipynb
index 5684d66a3..64926e297 100644
--- a/nbs/src/core/models.ipynb
+++ b/nbs/src/core/models.ipynb
@@ -10428,7 +10428,7 @@
     "    \n",
     "    $$\\sigma_t^2 = w + \\sum_{i=1}^p a_i y_{t-i}^2 + \\sum_{j=1}^q b_j \\sigma_{t-j}^2$$. \n",
     "    \n",
-    "    Here {$v_t$} is a sequence of iid random variables with zero mean and unit variance. \n",
+    "    Here \\{$v_t$} is a sequence of iid random variables with zero mean and unit variance. \n",
     "    The coefficients $w$, $a_i$, $i=1,...,p$, and $b_j$, $j=1,...,q$ must satisfy the following conditions: \n",
     "    \n",
     "    1. $w > 0$ and $a_i, b_j \\geq 0$ for all $i$ and $j$. \n",