Minor rewrite of Math Behind Rx file
Minor rewrite of Math Behind Rx file

shiratsu/RxSwift,ReactiveX/RxSwift,tottakai/RxSwift,cfraz89/RxSwift,KyoheiG3/RxSwift,cfraz89/RxSwift,ReactiveX/RxSwift,cfraz89/RxSwift,kzaher/RxSwift,shiratsu/RxSwift,ReactiveX/RxSwift,kzaher/RxSwift,KyoheiG3/RxSwift,cfraz89/RxSwift,tottakai/RxSwift,shiratsu/RxSwift,tottakai/RxSwift,KyoheiG3/RxSwift,kzaher/RxSwift,kzaher/RxSwift