It's summer in Antarctica ... Can you help this absent-minded scientist ?
"On Monday, I noted the temperature on a sheet of paper but I lost it.
On Tuesday, I noted in my notebook it was 2 degrees less than Monday.
Wednesday morning it was one degree less.
Wednesday afternoon, on the other hand, the temperature went up 2 degrees
and the thermometer was showing 4 degrees."
But wich temperature was it this Monday ?