[eschaider]

Mark fired the first shot, and FWIW four function math includes the use of any of the four functions, although all four were used in the spreadsheet.

It is good that you have learned so much from Mark's posts. He seems to play fast and loose with numbers and other things like facts. His representation of tens of thousands of engines that he maintains he has balanced was given a light review by Jerry when he only counted to the first “tens” of thousands. Mark said tens of thousands.

If we give him the benefit of the doubt and limit his tens to only two tens of thousands, then the number of engines he has balanced in a day over 30 years is three engines every day, every week of every year with no time off for vacation or holidays — a superhuman effort by any standard. If it is over20 years, then it is five engines per day every week of the year with no time off for vacation or holidays. This is not only impossible, the representation is absurd.

Obviously, this kind of balancing performance is beyond the capability of any human being and is yet another example of Mark playing fast and loose with numbers. He projects his own predilection to misrepresent fact onto others when they are delivering the real story about how to do something. This is a person you can not trust, can not respect, and can not rely upon to tell the truth.

If you don't like people attacking the position of others, you should speak to your friend and encourage him not to do that. When he does he will find some people will push back on mistruths to both clarify the actual facts and also to tag the perpetrator of the fiction so others will not be sucked in.