Exact(2)
In the accompanying letter, he adds: "The difficulty is that [Lenin] was always writing at white-heat on burning questions of the day (or even hour); and naturally his strategy and tactics changed to meet changing circumstances... My Russian edition has 55 large volumes, so there is ample room for selective quotation and even spurious interpolation.
At the same time, the nonlinear source term (f u,x,t)) adds the difficulty when we use the compact convergence theorem.
Similar(6)
He said he was in a "difficulty", adding: "The difficulty is very simple.
He added, "The difficulty is, when you have a character like this, you don't want to disgust the reader.
He added: "The difficulty is that if that then provokes higher inflation, if that then means that interest rates go up, who will pay the price for that?
"However," he added, "the difficulty of improving results in an overcrowded North American market is a major factor limiting margin expansion".
When to the difficulty of his theory is added the difficulty of his style, it becomes something of a mystery how he can exercise the profound influence on men's minds that he does.
The simplest («nine equivalents of nurse manpower use score» [NEMS], care levels) add the difficulty of not being useful for the calculation of staff, because the design is not oriented towards nursing.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com