AbstractGroup

abstract def plus(l: T, r: T): T

abstract def zero: T

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: Any): Boolean

final def asInstanceOf[T0]: T0

def assertNotZero(v: T): Unit

def clone(): AnyRef

final def eq(arg0: AnyRef): Boolean

def equals(arg0: Any): Boolean

def finalize(): Unit

final def getClass(): Class[_]

def hashCode(): Int

final def isInstanceOf[T0]: Boolean

def isNonZero(v: T): Boolean

def minus(l: T, r: T): T

final def ne(arg0: AnyRef): Boolean

def negate(v: T): T

def nonZeroOption(v: T): Option[T]

final def notify(): Unit

final def notifyAll(): Unit

def sum(vs: TraversableOnce[T]): T

def sumOption(iter: TraversableOnce[T]): Option[T]

override this if there is a faster way to do this sum than reduceLeftOption on plus

final def synchronized[T0](arg0: ⇒ T0): T0

def toString(): String

final def wait(): Unit

final def wait(arg0: Long, arg1: Int): Unit

final def wait(arg0: Long): Unit