title: Strange NDSolve Error in Mathematica
body: <p>I am trying to numerically solve a long list of ordinary differential equations using <code>NDSolve</code> as follows:</p>
  
  <p><code>sols = NDSolve[deqs, operons, {t, 0, 1000}];</code></p>
  
  <p>where <code>deqs</code> holds the list of differential equations and <code>operons</code> stores the list of functions.</p>
  
  <p>My error is "NDSolve::deqn: Equation or list of equations expected instead of False in the first argument "</p>
  
  <p>and a sample of the string of error code it gives me afterward is:</p>
  
  <p><code>acs'[t]==-0.04 acs[t]+(0.08Sin[0.01t]^4)/(1+Sin[&lt;&lt;1&gt;&gt;]^4), acs[0]==0, adaalkB'[t]==-0.04adaalkB[t]+0.08/(1+adaalkB[&lt;&lt;1&gt;&gt;]^2)</code></p>
  
  <p>where acs[t] and adaalkb[t] are two of the functions in the differential equation.</p>
  
  <p>I have no idea what the &lt;&lt;2>> or the &lt;&lt;1>> means, so if anyone could help, that would be appreciated.</p>