Sentence examples for main difficulties are from inspiring English sources

The main difficulties are that: usual Lq Lr estimates for the Stokes flow fail in this case; and the projection operator P L1(Rn+)→L1σ(Rn+) becomes unbounded.

Two main difficulties are involved herein: the first concerns the flexibility that appears in the joint between the load and the actuator; and the second focuses on the robustness to uncertainties, such as load and motor parameters.

Given the design-dependent characteristic of body-forces, three main difficulties are encountered when dealing with topology optimization problems under this load condition, namely, the non-monotonous behavior of the compliance, inactive volume constraint of the optimum, and parasitic effect in low-density regions.

The main difficulties are due to the fact that the inner product structure of Hilbert spaces fails to be true in Banach spaces.

The main difficulties are to find the appropriate limit functional for the control of the homogenized system and to identify the limit of the controls.

Due to the undecided number of nodes even during a short duration, the main difficulties are mobility property and reasons for node failure.

For us, the singers, one of the main difficulties was keeping it together emotionally while performing these pieces.

In a job like his, one of the main difficulties is establishing effective communication.

However, the fabrication of high quality crystalline InN is not straightforward; one of the main difficulties is the lack of a suitable substrate.

One of the main difficulties is the tendency of some pesticides to degrade in natural matrices.

One of the main difficulties is that often patients do not present symptoms or signs until the disease is advanced.