Mathematically, paying one extra mortgage payment a year for 30 years offers significant savings.Look for a PM that can pay you electronically, if not, mobile deposits bank app.Venmo and PayPal.Always monitor your DTI.Keep LTV under 70%Accurately Reporting Rental Income: Some people repair as much as possible to expense as much as possible, in order to reduce their tax burden.

And mathematically that is best.

So it's purely a mathematical opinion, which is why I mentioned it.

There is a lot of data showing that it will most likely appreciate, but there is zero "proof" that it will 100% definitely appreciate.A mathematical comparison is Brocard's Conjecture, which has been tested out to "2 * 10^9" but is still only accepted as a conjecture.

As an MS in Physics and Mathematics, I take quantum field theory as the most fundamental level of Reality.

The mathematical formula for buy and hold and flipping is 1:6. 3.

Still spouting this mathematical nonsense?

Using leverage is just applying mathematical principles to the real world.

Jeff Beard maybe I cannot convince you but mathematically, in recent times, the appreciating markets (San Fran, Los Angeles, OC, San Diego) have out performed virtually every cash flow area.  

Some landlords use a mathematical equation, called RUBS, to bill based on the size of the unit or other factors, this is just as inaccurate and down right illegal in a lot of places.