As the creator, you can change the permission of this map, and the permission of all the topics and synapses you have authority to change will change as well.
<% if policy(@map).update? %>
<%= @map.desc %>
<% else %>
<%= @map.desc %>
<% end %>
Created by: <%= @map.user == user ? "You" : @map.user.name %> on <%= @map.created_at.strftime("%m/%d/%Y") %>
Last edited: <%= @map.updated_at.strftime("%m/%d/%Y") %>