fixes

nvim/ultisnips/tex.snippets

@@ -146,17 +146,21 @@ snippet iff "Iff" Ai
 endsnippet
 
 context "math()"
-snippet bm "Bm" Ai
+snippet `(?<!\\)bm` "Bm" rwAi
 \bm{$1}$0
 endsnippet
 
+snippet `(?<!\\)emph` "Emphasize" rwAi
+\emph{$1}$0
+endsnippet
+
 context "math()"
-snippet sqrt "Square root" Ai
+snippet `(?<!\\)sqrt` "Square root" rwAi
 \sqrt{$1}$0
 endsnippet
 
 context "math()"
-snippet box "Boxed" Ai
+snippet `(?<!\\)box` "Boxed" rwAi
 \boxed{$1}$0
 endsnippet
 
@@ -330,6 +334,12 @@ snippet rowvec "Row Vector" iA
 \mqty[$1]$0
 endsnippet
 
+priority 200
+context "math()"
+snippet cvec "Column Vector" iA
+\begin{pmatrix} ${1:x}_${2:1}\\\\ \vdots\\\\ $1_${2:n} \end{pmatrix}
+endsnippet
+
 context "math()"
 snippet case "Cases" wA
 \begin{case}
@@ -381,16 +391,26 @@ endsnippet
 
 priority 1000
 context "math()"
-snippet epsi "Epsilon" wA
+snippet `(?<!\\)epsi` "Epsilon" rwA
 \epsilon
 endsnippet
 
 priority 500
 context "math()"
-snippet '(?<!\\)(alpha|beta|gamma|Delta|delta|epsilon|zeta|eta|Theta|theta|iota|kappa|Lambda|lambda|mu|nu|Xi|xi|Pi|pi|varpi|Sigma|sigma|tau|Phi|phi|varphi|chi|Psi|psi|Omega|omega)' "Greek" rwA
+snippet '(?<!\\)(alpha|beta|gamma|Delta|delta|epsilon|zeta|eta|Theta|theta|iota|kappa|Lambda|lambda|mu|nu|Xi|Pi|pi|varpi|Sigma|sigma|tau|Phi|phi|varphi|chi|Psi|psi|Omega|omega)' "Greek" rwA
 \\`!p snip.rv = match.group(1)`
 endsnippet
 
+context "math()"
+snippet '(?<!\\)xxi' "Xi" rwA
+\xi
+endsnippet
+
+context "math()"
+snippet '(?<!\\)rho' "Rho" rwA
+\rho
+endsnippet
+
 context "math()"
 snippet // "Fraction" iA
 \\frac{${VISUAL}}{$1}$0
@@ -622,7 +642,7 @@ endsnippet
 
 context "math()"
 snippet prod "Product" w
-\prod{${1:n=${2:1}}}^{${3:\infty}} $4
+\prod_{${1:n=${2:1}}}^{${3:\infty}} $4
 endsnippet
 
 context "math()"
@@ -651,7 +671,7 @@ snippet part "Partial Derivative" w
 endsnippet
 
 context "math()"
-snippet dd "Differential" wA
+snippet `(?<!\\)dd` "Differential" rwA
 \dd{$1}$0
 endsnippet