Can someone explain these important equations please?

Alpha decay
$_Z^AX\rightarrow _{Z-2}^{A-4}Y+_2^4He$
Beta- decay
$_Z^AX\rightarrow _{Z+1}^AY+_{-1}^0e+\bar v$
$_0^1n\rightarrow _1^1p+_{-1}^0e+\bar v$
Beta+ decay
$_Z^AX\rightarrow _{Z-1}^AY+_{+1}^0e+v$
$_1^1p\rightarrow _0^1n+_{+1}^0e+v$
Electron capture
$_Z^AX+_{-1}^0e\rightarrow _{Z-1}^AY+v$
$_1^1p+_{-1}^0e\rightarrow _0^1n+v$

Hopefully my formatting is not fucked since this is the first time I'm doing LaTeX on phone