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Hi, I contact you because I want to implement a code of a model of a reaction-diffusion equations system of the form:<br><br><font style="font-size:20pt" size="5"><font style="font-size:16pt" size="4">$B&E"_(B</font><font style="font-size:8pt" size="1">t<font style="font-size:16pt" size="4">v + 4v(v*v-1) - $B&E(B*<font style="font-size:20pt" size="5"><font style="font-size:8pt" size="1"><font style="font-size:16pt" size="4">$B&E(B div M<font style="font-size:10pt" size="2">i</font></font></font></font></font></font></font><font style="font-size:20pt" size="5"><font style="font-size:16pt" size="4"> </font></font><img class="ecxtex" alt="\mathbf{\nabla}" src="http://upload.wikimedia.org/math/3/d/1/3d1b81d5c3e9e5b8d3b446ae8cd8abb3.png"><font style="font-size:16pt" size="4">u<font style="font-size:10pt" size="2">i <font style="font-size:16pt" size="4">= 0</font><br></font></font><br><font style="font-size:20pt" size="5"><font style="font-size:16pt" size="4">$B&E"_(B</fon!
t><font style="font-size:8pt" size="1">t<font style="font-size:16pt" size="4">v + 4v(v*v-1) - $B&E(B*<font style="font-size:20pt" size="5"><font style="font-size:8pt" size="1"><font style="font-size:16pt" size="4">$B&E(B div M<font style="font-size:10pt" size="2">e</font></font></font></font></font></font></font><font style="font-size:20pt" size="5"><font style="font-size:16pt" size="4"> </font></font><img class="ecxtex" alt="\mathbf{\nabla}" src="http://upload.wikimedia.org/math/3/d/1/3d1b81d5c3e9e5b8d3b446ae8cd8abb3.png"><font style="font-size:16pt" size="4">u<font style="font-size:10pt" size="2">e <font style="font-size:16pt" size="4">= 0<br><br><font style="font-size:10pt" size="2">with <br><br><font style="font-size:16pt" size="4">$B&8(B = (0,1.4) x (0,1.4)</font><br><br><font style="font-size:16pt" size="4">v = u<font style="font-size:10pt" size="2">i</font> - u<font style="font-size:10pt" size="2">e<br></font></font></font></font></font></font><br><font style="!
font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font s
tyle="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4">u<font style="font-size:10pt" size="2">i<font style="font-size:16pt" size="4">(.,0)=-0.5 <font style="font-size:10pt" size="2">in <font style="font-size:16pt" size="4">A<font style="font-size:10pt" size="2">0<font style="font-size:16pt" size="4"> <font style="font-size:10pt" size="2">=</font> <font style="font-size:10pt" size="2"><span id="ecxresult_box" class="ecxshort_text" lang="en"><span class="ecxhps">a quarter of a</span> <span class="ecxhps">circumference</span> <span class="ecxhps">of</span> <span class="ecxhps">unit radius</span></span></font></font></font></font></font></font></font></font></font></font></font></font></font></font></fon!
t></font></font></font><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><br></font></font></font></font></font></font><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4">u<font style="font-size:10pt" size="2">i<font style="font-size:16pt" size="4">(.,0)=+0.5 <font style="font-size:10pt" size="2">in </font></font></font></font></font></font></font></font></font></font></font></font></font></font><font style="font-size:16pt" size="4"><font s!
tyle="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><
font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4">$B&8(B\</font></font></font></font></font>A<font style="font-size:10pt" size="2">0<br></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" s!
ize="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4">u<font style="font-size:10pt" size="2"><font style="font-size:10pt" size="2">e</font><font style="font-size:16pt" size="4">(.,0)=+0.5 <font style="font-size:10pt" size="2">in <font style="font-size:16pt" size="4">A<font style="font-size:10pt" size="2">0<br></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><fo!
nt style="font-size:10pt" size="2"><font style="font-size:16pt" size="
4">u<font style="font-size:10pt" size="2">e</font><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4">(.,0)=-0.5 <font style="font-size:10pt" size="2">in </font></font></font></font></font></font></font></font></font></font></font></font></font></font><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" !
size="2"><font style="font-size:16pt" size="4">$B&8(B\</font></font></font></font></font>A<font style="font-size:10pt" size="2">0</font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font><br><br><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4">v =1 <font style="font-size:10pt" size="2">o</font></font></font></font></font></font><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font!
style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"
>n <font style="font-size:16pt" size="4">$B&#(B<font style="font-size:10pt" size="2">1 =top and right sides of the square<br></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font><br><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:20pt" size="5"><font style="font-size:16pt" size="4">$B"_(B</font></font>v/</font></font></font></font></font><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:20pt" size="5"><font style="font-size:16pt" size="4">$B"_(Bn</font></font> =0 <font style="font-size:10pt" size="2">o</font></font></font></font></font></font><font style="font-size:16pt" size="4"><font sty!
le="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2"><font style="font-size:16pt" size="4"><font style="font-size:10pt" size="2">n <font style="font-size:16pt" size="4">$B&#(B<font style="font-size:10pt" size="2">2 =left and bottom sides of the square<br><br><br><br>This problem is referred to the cardiac bioelectric activity. I choose this topic for my thesis in Maths in Brescia (Italy).<br><br>Could you help me with some documentation or ideas?..I see tutorials in dune-fem-howto, I understand the basis concepts, but a problem like this is a little hard to solve.<br><br>Thank you very much<br><br>Mauro Pagani<br></font></!
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