Sentence examples for a main difficulty is from inspiring English sources

A main difficulty is that they generally include time differentiated versions of known signals which are difficult to estimate in a noisy environment.

Turning now to difficulties with CDQ, a main difficulty is that it isn't clear whether the use of the notion of familiarity in the account of conditional donkey sentences can be ultimately upheld.

The main difficulty is that, a sliding mode surface cannot be designed based on the unknown transition rate and unmeasurable state directly.

(3) Concerning the local martingale analogue of Proposition 2.8, the main difficulty is that a local ((mathbb {G},mathbb {P} -martingale need not be localized by a sequence of (mathbb {P} -martingalemes.

The main difficulty is to obtain a numerical approximation of the resonance modes: their calculation leads to solving the Fourier transform of the system of homogeneous equations.

For the Gaussian case, the main difficulty is to find a upper bound for which the optimal input distribution can be found and evaluated.

The main difficulty is in constructing a meaningful multiple alignment with proteins whose number of zinc fingers varies from 7 to 21.

The main difficulty is not knowing what's a trend, what's a backlash, and what's a blip.

Quite recently a modified approach has been proposed [1], in which the main difficulty is overcome, and some preliminary results were given for a tapered beam.

Under this framework, the main difficulty is to design an appropriate kernel function to represent the sense distinction knowledge.

The main difficulty is to preserve an adequate diagnostic image quality reducing exposure mAs values and therefore reducing the dose to the patient [6, 7].