Hello,
I am reading the book "Computational Methods for Plasticity" by Neto, Peric and Owen and one particular sentence is confusing me. At page 57 after (3.81) the book says "..it is worth pointing out that the infinitesimal strain tensor is a linear functional of the displacement vector field". Isn't a functional a mapping to one scalar value (as the total potential energy functional or the virtual work functional)? Could anybody help me out with that?
Thanks in advance
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