this.gt=function(a,b){
    return a>b;
}

this.ge=function(a,b){
    return a>=b;
}

this.eq=function(a,b){
    return a==b;
}

this.lt=function(a,b){
    return a<b;
}

this.le=function(a,b){
    return a<=b;
}

this.neq=function(a,b){
    return a!=b;
}
