Equity jurisdiction

Definition and stakes

Edward Douglass White San Francisco National Bank v. Dodge…

And though we have repeatedly decided in this court that the statute of a state cannot control the mode of procedure in equity cases in Federal courts, nor deprive them of their separate equity jurisdiction, we have also held that, where a statute of a state created a new right or provided a new remedy, the Federal courts will enforce that right, either on the common-law or equity side of its docket, as the nature of the new right or new remedy requires.
Source: Wikisource

Nathan Clifford Tyler v. Magwire — Opinion of the Court

A bill in equity is not the proper remedy to recover the possession of lands; and where there is an adequate and complete remedy at law, a court of equity will not interpose unless upon some matters coming under some peculiar head of concurrent equity jurisdiction. [6]
'In those cases where it is permissible under the code to combine in the same proceeding or petition legal and equitable claim, the matter in equity and the action at law must be separately stated, and must necessarily be separately tried.
Source: Wikisource

by John Marshall Harlan Coosaw Mining Company v. South Carolina…

It is necessary, therefore, to inquire whether, according to the principles of equity, as recognized in the courts of the United States, the state can obtain relief by a suit in equity.
The grounds of equity jurisdiction in such cases as the one before us are substantially those upon which courts of equity interfere in cases of waste, public nuisance, and purpresture.
Source: Wikisource

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