public FieldElement sub(FieldElement fe) {
BigInteger result = this.elem.subtract(fe.bigIntegerValue());
result = result.mod(MOD);
if (result.compareTo(BigInteger.ZERO) < 0) {
result.add(MOD);
}
return new FieldElement(result, MOD);
}
public FieldElement mult(FieldElement fe) {
BigInteger result = this.elem.multiply(fe.bigIntegerValue());
result = result.mod(MOD);
return new FieldElement(result, MOD);
}