Ring of mixed characteristic
In commutative algebra, a ring of mixed characteristic is a commutative ring ![R](/Images/godic/202501/27/e1e1d3d40573127e9ee0480caf1283d61121.png")
having characteristic zero and having an ideal ![I](/Images/godic/202501/27/dd7536794b63bf90eccfd37f9b147d7f1121.png")
such that ![R/I](/Images/godic/202501/27/199e770aefdf9e1969110b945e19e6ef1121.png")
has positive characteristic.
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